Euphonium are the tuba-euphonium quartet or larger tuba-euphonium ensemble; the brass quintet, where it can supply the tenor voice, though the trombone is much more common in this role; and other mixed brass ensemble. Such ensembles are almost non-existent: they are more likely to be semi-professional or amateur in nature. Most of the United States Armed Forces service bands include a tuba-euphonium quartet made up of players from the band that occasionally performs in its own right. The euphonium is not traditionally an orchestral instrument and has not been common in symphony orchestras. However, there are a few works from the
Brass instrument Baroque or Classical pieces. In more modern compositions, they are occasionally used for their intonation or tone color. Brass instruments may also be characterised by two generalizations about geometry of the bore, that is, the tubing between the mouthpiece and the flaring of the tubing into the bell. Those two generalizations are with regard to While all modern valved and slide brass instruments consist in part of conical and in part of cylindrical tubing, they are divided as follows: The second division, based on bore diameter in relation to length, determines whether the fundamental tone or the first overtone is