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Repeated lines in music or poetry

A refrain (from Vulgar Latin refringere, "to repeat", and later from Old French refraindre) is the line or lines that are repeated in music or in poetry — the "chorus" of a song. Poetic fixed forms that feature refrains include the villanelle, the virelay, and the sestina. In popular music, the refrain or chorus may contrast with the verse melodically, rhythmically, and harmonically; it may assume a higher level of dynamics and activity, often with added instrumentation. Chorus form, or strophic form, is a sectional and/or additive way of structuring a piece of music based on the repetition of one formal section or block played repeatedly.

There are two distinct uses of the word "chorus". In the thirty two bar song form that was most common in the earlier twentieth century popular music (especially the Tin Pan Alley tradition), "chorus" referred to the entire main section of the song (which was in a thirty two bar AABA form). Beginning in the rock music of the 1950s, another form became more common in commercial pop music, which was based in an open ended cycle of verses instead of a fixed 32 bar form. In this form (which is more common than thirty two bar form in later twentieth century pop music), "choruses" with fixed lyrics are alternated with "verses" in which the lyrics are different with each repetition. In this use of the word, chorus contrasts with the verse, which usually has a sense of leading up to the chorus. "Many popular songs, particularly from early in this century, are in a verse and a chorus (refrain) form. Most popular songs from the middle of the century consist only of a chorus." While the terms 'refrain' and 'chorus' often are used synonymously, it has been suggested to use 'refrain' exclusively for a recurring line of identical text and melody which is part of a formal section—an A section in an AABA form (as in I Got Rhythm: " who could ask for anything more?") or a verse (as in Blowing in the Wind: " the answer my friend is blowing in the wind")—whereas 'chorus' shall refer to a discrete form part (as in Yellow Submarine: "We all live in a "). According to the musicologists Ralf von Appen and Markus Frei Hauenschild,
In German, the term, "Refrain," is used synonymously with "chorus" when referring to a chorus within the verse/chorus form. At least one English language author, Richard Middleton, uses the term in the same way. In English usage, however, the term, »refrain« typically refers to what in German is more precisely called the »Refrainzeile« (refrain line): a lyric at the beginning or end of a section that is repeated in every iteration. In this usage, the refrain does not constitute a discrete, independent section within the form.

Many Tin Pan Alley songs using thirty two bar form are central to the traditional jazz repertoire. In jazz arrangements the word "chorus" refers to the same unit of music as in the Tin Pan Alley tradition, but unlike the Tin Pan Alley tradition a single song can have more than one chorus. Von Appen and Frei Hauenschild explain, "The term, 'chorus' can also refer to a single iteration of the entire 32 bars of the AABA form, especially among jazz musicians, who improvise over multiple repetitions of such choruses."

In jazz, an arranger's chorus is where the arranger uses particularly elaborate techniques to exhibit their skill and to impress the listener. This may include use of counterpoint, reharmonization, tone color, or any other arranging device. The arranger's chorus is generally not the first or the last chorus of a jazz performance.

In jazz, a shout chorus (occasionally: out chorus) is usually the last chorus of a big band arrangement, and is characterized by being the most energetic, lively, and exciting and by containing the musical climax of the piece. A shout chorus characteristically employs extreme ranges, loud dynamics, and a re arrangement of melodic motives into short, accented riffs. Shout choruses often feature tutti or concerted writing, but may also use contrapuntal writing or call and response between the brass and saxophones, or between the ensemble and the drummer. Additionally, brass players frequently use extended techniques such as falls, doits, turns, and shakes to add excitement.