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Brass instrumentthe brass instrument

The mellophone is a brass instrument used in marching bands and drum and bugle corps in place of French horns. It is a middle voiced instrument, typically pitched in the key of F, though models in E, D, C, and G (as a bugle) have also historically existed. It has a conical bore, like that of the euphonium and flugelhorn. It can also be used to play French horn parts in concert bands and orchestras. These instruments are used instead of French horns for marching because their bells face forward instead of to the back (or to the side), as dissipation of the sound becomes a concern in the open air environment of marching. Tuning is done solely by adjusting the tuning slide, unlike the French horn where the pitch is affected by the hand position in the bell. Fingerings for the mellophone are the same as fingerings for the trumpet, alto (tenor) horn, and most valved brass instruments. Owing to its use primarily outside concert music, there is little solo literature for the mellophone, other than that used within drum and bugle corps, and a single concerto written for the instrument.

The present day mellophone has three valves, operated with the right hand (1 and 2 valve mellophone bugles have been used in the past). Mellophone fingerings are the same as the trumpet. It is typically pitched lower, in the key of F or E. The overtone series of the F mellophone is an octave above that of the F horn. The tubing length of a mellophone is the same as that of the F alto (high) single horn or the F alto (high) branch of a triple horn or double descant horn. The direction of the bell as well as the much reduced amount of tubing (compared to a French horn) make the mellophone look like a large trumpet. The mellophone uses the same mouthpiece as the alto (tenor) horn, which is in between the size of a trombone and trumpet mouthpiece. This mouthpiece usually has a deep cup, like that of the flugelhorn, and has a wider inner diameter than a trumpet mouthpiece. These mouthpieces give the mellophone a dark, round sound. Some trumpet players who double on mellophone use a trumpet style parabolic ("cup") mouthpiece on the instrument, resulting in a much brighter, more trumpet like sound. Horn players doubling on mellophone often use a smaller, lighter, conical ("funnel") mouthpiece, as used on French horns, with an adapter to allow them to fit in the larger bore leadpipe of the mellophone. This style mouthpiece gives the instrument a warmer sound than using a trumpet mouthpiece, and allows French horn players to play the mellophone without changing their embouchure between the two instruments.

The marching mellophone is used in place of the horn for marching because it is a bell front instrument allowing projection of the sound in the direction that the player is facing. This is especially important in drum corps and marching bands because the audience is typically on only one side of the ensemble. Mellophones are usually constructed with a smaller bore for louder volume than marching French horns. There are also marching B French horns with a bell front configuration; these do use a horn mouthpiece and have a more French horn like sound, but are more difficult to play accurately on the field. Another factor in the greater use of mellophones is its ease of use as compared to the difficulty of playing a French horn consistently well. In a French horn, the length of tubing (and the bore size) make the partials much closer together than other brass instruments in their normal range and, therefore, harder to play accurately. The F mellophone has tubing half the length of a French horn, which gives it an overtone series more similar to a trumpet and most other brass instruments. The mellophone is an instrument designed specifically to bring the approximate sound of a horn in a package which is conducive to playing while marching. Outside a marching setting, the traditional French horn is ubiquitous and the mellophone is rarely used.

C. G. Conn developed its 16E "Mellophonium" and first marketed it in 1957. It is essentially a "classic" or "concert" mellophone that has figuratively been partially unwrapped to form a bell forward instrument. American bandleader Stan Kenton himself was not involved in the design of the mellophonium; in 1961, however, he provided an endorsement for Conn's advertising upon adopting the instrument. Kenton had, for several years, wished to add another brass voice alongside the trumpets and trombones in his orchestra and experimented unsuccessfully with additional instruments, before discovering the Conn Mellophonium, which bridged the gap he was seeking to fill:

In 1962, Kenton explained: "For some time, I recognized the need for using an instrument that would not only give the orchestra another solo voice, but would add more warmth and emphasis to the thematic line. The Mellophonium has not only met all the preliminary requirements, but has also suggested intriguing new ways to shade and dramatize sound. My decision to use four Mellophoniums didn't just happen overnight. Nor are they gimmick instruments. Both the arranging staff and myself realized the need for an instrument that would capture the width of sound that virtually lay untouched between the trumpets and trombones. We first tried ten trumpets—five B flat and five E flat. They didn't make it because it was impossible to distinguish any difference between the two instruments After experimenting for two days with the flugelhorn, we were ready to give it up completely! Finally, the Conn Instrument Corporation learned that we were interested in locating a new brass instrument and asked us to try the mellophonium. After much experimentation and many preliminary rehearsals, the Mellophonium became the answer we had been looking for." The instrument could be played by a trumpeter with relative ease, though most Mellophonium players in Kenton's band were reluctant users of the instrument due to its difficulty to play in tune particularly in the higher registers. Several trumpeters quit in protest rather than switch full time to Mellophonium, and only a few band members preferred the new instrument. Kenton used a four man mellophonium section September 1960 through November 1963 on 11 albums; two of those LPs received Grammy Awards (Kenton's West Side Story and Adventures In Jazz).

The Vincent Bach Corporation also produced a mellophonium, with the shape of the tubing more reminiscent of the cornet.

The F. E. Olds company manufactured mellophoniums with the same wrap as the Vincent Bach Corporation design.

The Holton company manufactured mellophoniums with a trumpet like lead pipe and valve assembly with the rest being comparable to a mellophonium.