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Full musical score showing each part on a separate line or staff

Sheet music is a handwritten or printed form of musical notation that uses musical symbols to indicate the pitches, rhythms, or chords of a song or instrumental musical piece. Like its analogs – printed books or pamphlets in English, Arabic, or other languages – the medium of sheet music typically is paper (or, in earlier centuries, papyrus or parchment). However, access to musical notation since the 1980s has included the presentation of musical notation on computer screens and the development of scorewriter computer programs that can notate a song or piece electronically, and, in some cases, "play back" the notated music using a synthesizer or virtual instruments. The use of the term "sheet" is intended to differentiate written or printed forms of music from sound recordings (on vinyl record, cassette, CD), radio or TV broadcasts or recorded live performances, which may capture film or video footage of the performance as well as the audio component. In everyday use, "sheet music" (or simply "music") can refer to the print publication of commercial sheet music in conjunction with the release of a new film, TV show, record album, or other unique or popular event which involves music. The first printed sheet music made with a printing press was made in 1473. Sheet music is the basic form in which Western classical music is notated so that it can be learned and performed by solo singers or instrumentalists or musical ensembles. Many forms of traditional and popular Western music are commonly learned by singers and musicians "by ear", rather than by using sheet music (although in many cases, traditional and pop music may also be available in sheet music form). The term score is a common alternative (and more generic) term for sheet music, and there are several types of scores, as discussed below. The term score can also refer to theatre music, orchestral music or songs written for a play, musical, opera or ballet, or to music or songs written for a television programme or film; for the last of these, see Film score.

Sheet music from the 20th and 21st century typically indicates the title of the song or composition on a title page or cover, or on the top of the first page, if there is no title page or cover. If the song or piece is from a movie, Broadway musical, or opera, the title of the main work from which the song/piece is taken may be indicated. If the songwriter or composer is known, their name is typically indicated along with the title. The sheet music may also indicate the name of the lyric writer, if the lyrics are by a person other than one of the songwriters or composers. It may also include the name of the arranger, if the song or piece has been arranged for the publication. No songwriter or composer name may be indicated for old folk music, traditional songs in genres such as blues and bluegrass, and very old traditional hymns and spirituals, because for this music, the authors are often unknown; in such cases, the word Traditional is often placed where the composer's name would ordinarily go. Title pages for songs may have a picture illustrating the characters, setting, or events from the lyrics. Title pages from instrumental works may omit an illustration, unless the work is program music which has, by its title or section names, associations with a setting, characters, or story.

Sheet music can be used as a record of, a guide to, or a means to perform, a song or piece of music. Sheet music enables instrumental performers who are able to read music notation (a pianist, orchestral instrument players, a jazz band, etc.) or singers to perform a song or piece. Music students use sheet music to learn about different styles and genres of music. The intended purpose of an edition of sheet music affects its design and layout. If sheet music is intended for study purposes, as in a music history class, the notes and staff can be made smaller and the editor does not have to be worried about page turns. For a performance score, however, the notes have to be readable from a music stand and the editor has to avoid excessive page turns and ensure that any page turns are placed after a rest or pause (if possible). As well, a score or part in a thick bound book will not stay open, so a performance score or part needs to be in a thinner binding or use a binding format which will lie open on a music stand. In classical music, authoritative musical information about a piece can be gained by studying the written sketches and early versions of compositions that the composer might have retained, as well as the final autograph score and personal markings on proofs and printed scores. Comprehending sheet music requires a special form of literacy: the ability to read music notation. An ability to read or write music is not a requirement to compose music. There have been a number of composers and songwriters who have been capable of producing music without the capacity themselves to read or write in musical notation, as long as an amanuensis of some sort is available to write down the melodies they think of. Examples include the blind 18th century composer John Stanley and the 20th century songwriters Lionel Bart, Irving Berlin and Paul McCartney. As well, in traditional music styles such as the blues and folk music, there are many prolific songwriters who could not read music, and instead played and sang music "by ear". The skill of sight reading is the ability of a musician to perform an unfamiliar work of music upon viewing the sheet music for the first time. Sight reading ability is expected of professional musicians and serious amateurs who play classical music, jazz and related forms. An even more refined skill is the ability to look at a new piece of music and hear most or all of the sounds (melodies, harmonies, timbres, etc.) in one's head without having to play the piece or hear it played or sung. Skilled composers and conductors have this ability, with Beethoven being a noted historical example. Not everyone has that specific skill. For some people music sheets are meaningless, whereas others may view them as melodies and a form of art. Classical musicians playing orchestral works, chamber music, sonatas and singing choral works ordinarily have the sheet music in front of them on a music stand when performing (or held in front of them in a music folder, in the case of a choir), with the exception of solo instrumental performances of solo pieces, concertos, or solo vocal pieces (art song, opera arias, etc. ), where memorization is expected. In jazz, which is mostly improvised, sheet music (called a lead sheet in this context) is used to give basic indications of melodies, chord changes, and arrangements. Even when a jazz band has a lead sheet, chord chart or arranged music, many elements of a performance are improvised. Handwritten or printed music is less important in other traditions of musical practice, however, such as traditional music and folk music, in which singers and instrumentalists typically learn songs "by ear" or from having a song or tune taught to them by another person. Although much popular music is published in notation of some sort, it is quite common for people to learn a song by ear. This is also the case in most forms of western folk music, where songs and dances are passed down by oral – and aural – tradition. Music of other cultures, both folk and classical, is often transmitted orally, though some non Western cultures developed their own forms of musical notation and sheet music as well. Although sheet music is often thought of as being a platform for new music and an aid to composition (i. e., the composer "writes" the music down), it can also serve as a visual record of music that already exists. Scholars and others have made transcriptions to render Western and non Western music in readable form for study, analysis and re creative performance. This has been done not only with folk or traditional music (e. g., Bartók's volumes of Magyar and Romanian folk music), but also with sound recordings of improvisations by musicians (e. g., jazz piano) and performances that may only partially be based on notation. An exhaustive example of the latter in recent times is the collection The Beatles: Complete Scores (London: Wise Publications, 1993), which seeks to transcribe into staves and tablature all the songs as recorded by the Beatles in instrumental and vocal detail.

Modern sheet music may come in different formats. If a piece is composed for just one instrument or voice (such as a piece for a solo instrument or for a cappella solo voice), the whole work may be written or printed as one piece of sheet music. If an instrumental piece is intended to be performed by more than one person, each performer will usually have a separate piece of sheet music, called a part, to play from. This is especially the case in the publication of works requiring more than four or so performers, though invariably a full score is published as well. The sung parts in a vocal work are not usually issued separately today, although this was historically the case, especially before music printing made sheet music widely available. Sheet music can be issued as individual pieces or works (for example, a popular song or a Beethoven sonata), in collections (for example works by one or several composers), as pieces performed by a given artist, etc. When the separate instrumental and vocal parts of a musical work are printed together, the resulting sheet music is called a score. Conventionally, a score consists of musical notation with each instrumental or vocal part in vertical alignment (meaning that concurrent events in the notation for each part are arranged in parallel). The term score has also been used to refer to sheet music written for only one performer. The distinction between score and part applies when there is more than one part needed for performance. Scores come in various formats.

A full score is a large book showing the music of all instruments or voices in a composition lined up in a fixed order. It is large enough for a conductor to be able to read while directing orchestra or opera rehearsals and performances. In addition to their practical use for conductors leading ensembles, full scores are also used by musicologists, music theorists, composers and music students who are studying a given work. A miniature score is like a full score but much reduced in size. It is too small for use in a performance by a conductor, but handy for studying a piece of music, whether it be for a large ensemble or a solo performer. A miniature score may contain some introductory remarks. A study score is sometimes the same size as, and often indistinguishable from, a miniature score, except in name. Some study scores are octavo size and are thus somewhere between full and miniature score sizes. A study score, especially when part of an anthology for academic study, may include extra comments about the music and markings for learning purposes. A piano score (or piano reduction) is a more or less literal transcription for piano of a piece intended for many performing parts, especially orchestral works; this can include purely instrumental sections within large vocal works (see vocal score immediately below). Such arrangements are made for either piano solo (two hands) or piano duet (one or two pianos, four hands). Extra small staves are sometimes added at certain points in piano scores for two hands to make the presentation more complete, though it is usually impractical or impossible to include them while playing. As with vocal score (below), it takes considerable skill to reduce an orchestral score to such smaller forms because the reduction needs to be not only playable on the keyboard but also thorough enough in its presentation of the intended harmonies, textures, figurations, etc. Sometimes markings are included to show which instruments are playing at given points. While piano scores are usually not meant for performance outside of study and pleasure (Franz Liszt's concert transcriptions of Beethoven's symphonies being one group of notable exceptions), ballets get the most practical benefit from piano scores because with one or two pianists they allow the ballet to do many rehearsals at a much lower cost, before an orchestra has to be hired for the final rehearsals. Piano scores can also be used to train beginning conductors, who can conduct a pianist playing a piano reduction of a symphony; this is much less costly than conducting a full orchestra. Piano scores of operas do not include separate staves for the vocal parts, but they may add the sung text and stage directions above the music. A part is an extraction from the full score of a particular instrument's part. It is used by orchestral players in performance, where the full score would be too cumbersome. However, in practice, it can be a substantial document if the work is lengthy, and a particular instrument is playing for much of its duration.

A vocal score (or, more properly, piano vocal score) is a reduction of the full score of a vocal work (e. g., opera, musical, oratorio, cantata, etc.) to show the vocal parts (solo and choral) on their staves and the orchestral parts in a piano reduction (usually for two hands) underneath the vocal parts; the purely orchestral sections of the score are also reduced for piano. If a portion of the work is a cappella, a piano reduction of the vocal parts is often added to aid in rehearsal (this often is the case with a cappella religious sheet music). Piano vocal scores serve as a convenient way for vocal soloists and choristers to learn the music and rehearse separately from the orchestra. The vocal score of a musical typically does not include the spoken dialogue, except for cues. Piano vocal scores are used to provide piano accompaniment for the performance of operas, musicals and oratorios by amateur groups and some small scale professional groups. This may be done by a single piano player or by two piano players. With some 2000s era musicals, keyboardists may play synthesizers instead of piano. The related but less common choral score contains the choral parts with reduced accompaniment. The comparable organ score exists as well, usually in association with church music for voices and orchestra, such as arrangements (by later hands) of Handel's Messiah. It is like the piano vocal score in that it includes staves for the vocal parts and reduces the orchestral parts to be performed by one person. Unlike the vocal score, the organ score is sometimes intended by the arranger to substitute for the orchestra in performance if necessary. A collection of songs from a given musical is usually printed under the label vocal selections. This is different from the vocal score from the same show in that it does not present the complete music, and the piano accompaniment is usually simplified and includes the melody line.

A short score is a reduction of a work for many instruments to just a few staves. Rather than composing directly in full score, many composers work out some type of short score while they are composing and later expand the complete orchestration. An opera, for instance, may be written first in a short score, then in full score, then reduced to a vocal score for rehearsal. Short scores are often not published; they may be more common for some performance venues (e. g., band) than in others. Because of their preliminary nature, short scores are the principal reference point for those composers wishing to attempt a 'completion' of another's unfinished work (e. g. Movements 2 through 5 of Gustav Mahler's 10th Symphony or the third act of Alban Berg's opera Lulu). An open score is a score of a polyphonic piece showing each voice on a separate staff. In Renaissance or Baroque keyboard pieces, open scores of four staves were sometimes used instead of the more modern convention of one staff per hand. It is also sometimes synonymous with full score (which may have more than one part per staff). In a close score, all voice parts are represented on the two major staffs (treble and bass staffs). Scores from the Baroque period (1600–1750) are very often in the form of a bass line in the bass clef and the melodies played by instrument or sung on an upper stave (or staves) in the treble clef. The bass line typically had figures written above the bass notes indicating which intervals above the bass (e. g., chords) should be played, an approach called figured bass. The figures indicate which intervals the harpsichordist, pipe organist or lute player should play above each bass note.

A lead sheet specifies only the melody, lyrics and harmony, using one staff with chord symbols placed above and lyrics below. It is commonly used in popular music and in jazz to capture the essential elements of song without specifying the details of how the song should be arranged or performed. A chord chart (or simply, chart) contains little or no melodic information at all but provides fundamental harmonic information. Some chord charts also indicate the rhythm that should be played, particularly if there is a syncopated series of "hits" that the arranger wants all of the rhythm section to perform. Otherwise, chord charts either leave the rhythm blank or indicate slashes for each beat. This is the most common kind of written music used by professional session musicians playing jazz or other forms of popular music and is intended for the rhythm section (usually containing piano, guitar, bass and drums) to improvise their accompaniment and for any improvising soloists (e. g., saxophone players or trumpet players) to use as a reference point for their extemporized lines. A fake book is a collection of jazz songs and tunes with just the basic elements of the music provided. There are two types of fake books: (1) collections of lead sheets, which include the melody, chords, and lyrics (if present), and (2) collections of songs and tunes with only the chords. Fake books that contain only the chords are used by rhythm section performers (notably chord playing musicians such as electric guitarists and piano players and the bassist) to help guide their improvisation of accompaniment parts for the song. Fake books with only the chords can also be used by "lead instruments" (e. g., saxophone or trumpet) as a guide to their improvised solo performances. Since the melody is not included in chord only fake books, lead instrument players are expected to know the melody. A tablature (or tab) is a special type of musical score – most typically for a solo instrument – which shows where to play the pitches on the given instrument rather than which pitches to produce, with rhythm indicated as well. Tablature is widely used in the 2000s for guitar and electric bass songs and pieces in popular music genres such as rock music and heavy metal music. This type of notation was first used in the late Middle Ages, and it has been used for keyboard (e. g., pipe organ) and for fretted string instruments (lute, guitar).

Song sheets are the printed lyrics without musical notation. Academic studies of American music call these sheets songsters. Over the first half of the 20th century, lyrics to songs were printed and sold individually, in collections on newspaper sized sheets, combined into booklets, and in magazines. Song sheets typically included photographs of famous entertainers associated with the song, as well as attributions to musical theater and films. Song sheets were recognized as competition to sheet music by the American Society of Composers, Authors and Publishers (ASCAP) in 1930, when a representative said, "Thousands now learn the popular melodies from the radio, the publishers state. With the lyrics available for five or ten cents and the strain known, impulse to buy sheet music is eliminated." While sheet music for a song might cost thirty or thirty five cents, a song sheet typically sold for a nickel or a dime. Choral societies would buy a single copy of the sheet music for the pianist and then multiple song sheets for the singers. When the lyrics are printed without permission from the copyright owner, the song sheets are called bootleg song sheets. Song sheet bootlegging was seen as a minor problem in Chicago in the early 1890s, but became a significant issue from 1929 through the 1930s. The first publishers and distributors of bootleg song sheets were charged with criminal copyright infringement in February, 1930. Through the efforts of the Music Publishers' Protective Association and law enforcement, as well as the advent of legal song sheet magazines, song sheet bootlegging ended in the early 1940s. The first legitimate song sheet magazines began in 1934, and Lyle Engels Song Hits which was first published in 1937 was successful for decades. Song sheet magazines included advertisements, gossip columns, record reviews, and promotional biographies of celebrities.

Outside modern eurocentric cultures exists a wide variety of systems of musical notation, each adapted to the peculiar needs of the musical cultures in question, and some highly evolved classical musics do not use notation at all (or only in rudimentary forms as mnemonic aids) such as the khyal and dhrupad forms of Northern India. Western musical notation systems describe only music adapted to the needs of musical forms and instruments based on equal temperament, but are ill equipped to describe musics of other types, such as the courtly forms of Japanese gagaku, Indian dhrupad, or the percussive music of ewe drumming. The infiltration of Western staff notation into these cultures has been described by the musicologist Alain Daniélou and others as a process of cultural imperialism.

Musical notation was developed before parchment or paper were used for writing. The earliest form of musical notation can be found in a cuneiform tablet that was created at Nippur, in Sumer (today's Iraq), in about 2000 BC. The tablet represents fragmentary instructions for performing music, that the music was composed in harmonies of thirds, and that it was written using a diatonic scale. A tablet from about 1250 BC shows a more developed form of notation. Although the interpretation of the notation system is still controversial, it is clear that the notation indicates the names of strings on a lyre, the tuning of which is described in other tablets. Although they are fragmentary, these tablets represent the earliest notated melodies found anywhere in the world.]] Mechanical plate engraving was developed in the late sixteenth century. Although plate engraving had been used since the early fifteenth century for creating visual art and maps, it was not applied to music until 1581. Plate engraving was the methodology of choice for music printing until the late nineteenth century, at which point its decline was hastened by the development of photographic technology. As musical composition increased in complexity, so too did the technology required to produce accurate musical scores. Unlike literary printing, which mainly contains printed words, music engraving communicates several different types of information simultaneously. To be clear to musicians, it is imperative that engraving techniques allow absolute precision. Notes of chords, dynamic markings, and other notation line up with vertical accuracy. If text is included, each syllable matches vertically with its assigned melody. Horizontally, subdivisions of beats are marked not only by their flags and beams, but also by the relative space between them on the page.]] In the 19th century, the music industry was dominated by sheet music publishers. In the United States, the sheet music industry rose in tandem with blackface minstrelsy. The group of New York City based music publishers, songwriters and composers dominating the industry was known as "Tin Pan Alley". In the mid 19th century, copyright control of melodies was not as strict, and publishers would often print their own versions of the songs popular at the time. With stronger copyright protection laws late in the century, songwriters, composers, lyricists, and publishers started working together for their mutual financial benefit. New York City publishers concentrated on vocal music. The biggest music houses established themselves in New York City, but small local publishers – often connected with commercial printers or music stores – continued to flourish throughout the country. An extraordinary number of East European immigrants became the music publishers and songwriters on Tin Pan Alley the most famous being Irving Berlin. Songwriters who became established producers of successful songs were hired to be on the staff of the music houses. The late 19th century saw a massive explosion of parlor music, with ownership of, and skill at playing the piano becoming de rigueur for the middle class family. In the late 19th century, if a middle class family wanted to hear a popular new song or piece, they would buy the sheet music and then perform the song or piece in an amateur fashion in their home. But in the early 20th century the phonograph and recorded music grew greatly in importance. This, joined by the growth in popularity of radio broadcasting from the 1920s on, lessened the importance of the sheet music publishers. The record industry eventually replaced the sheet music publishers as the music industry's largest force.

In the late 20th and into the 21st century, significant interest has developed in representing sheet music in a computer readable format (see music notation software), as well as downloadable files. Music OCR, software to "read" scanned sheet music so that the results can be manipulated, has been available since 1991. In 1998, virtual sheet music evolved further into what was to be termed digital sheet music, which for the first time allowed publishers to make copyright sheet music available for purchase online. Unlike their hard copy counterparts, these files allowed for manipulation such as instrument changes, transposition and MIDI (Musical Instrument Digital Interface) playback. The popularity of this instant delivery system among musicians appears to be acting as a catalyst of new growth for the industry well into the foreseeable future. An early computer notation program available for home computers was Music Construction Set, developed in 1984 and released for several different platforms. Introducing concepts largely unknown to the home user of the time, it allowed manipulation of notes and symbols with a pointing device such as a mouse; the user would "grab" a note or symbol from a palette and "drop" it onto the staff in the correct location. The program allowed playback of the produced music through various early sound cards, and could print the musical score on a graphics printer. Many software products for modern digital audio workstation and scorewriters for general personal computers support generation of sheet music from MIDI files, by a performer playing the notes on a MIDI equipped keyboard or other MIDI controller or by manual entry using a mouse or other computer device. By 1999, a system and method for coordinating music display among players in an orchestra was patented by Harry Connick Jr. It is a device with a computer screen which is used to show the sheet music for the musicians in an orchestra instead of the more commonly used paper. Connick uses this system when touring with his big band, for instance. With the proliferation of wireless networks and iPads similar systems have been developed. In the classical music world, some string quartet groups use computer screen based parts. There are several advantages to computer based parts. Since the score is on a computer screen, the user can adjust the contrast, brightness and even the size of the notes, to make reading easier. In addition, some systems will do "page turns" using a foot pedal, which means that the performer does not have to miss playing music during a page turn, as often occurs with paper parts. Of special practical interest for the general public is the Mutopia project, an effort to create a library of public domain sheet music, comparable to Project Gutenberg's library of public domain books. The International Music Score Library Project (IMSLP) is also attempting to create a virtual library containing all public domain musical scores, as well as scores from composers who are willing to share their music with the world free of charge. Some scorewriter computer programs have a feature that is very useful for composers and arrangers: the ability to "play back" the notated music using synthesizer sounds or virtual instruments. Due to the high cost of hiring a full symphony orchestra to play a new composition, before the development of these computer programs, many composers and arrangers were only able to hear their orchestral works by arranging them for piano, organ or string quartet. While a scorewiter program's playback will not contain the nuances of a professional orchestra recording, it still conveys a sense of the tone colors created by the piece and of the interplay of the different parts.