Euphonium main tuning slide trigger, which allows players more flexibility with intonation. The euphonium, like the tenor trombone, is pitched in concert B. For a valved brass instrument like the euphonium, this means that when no valves are in use the instrument will produce partials of the B harmonic series. It is generally orchestrated as a non-transposing instrument like the trombone, written at concert pitch in the bass clef with higher passages in the tenor clef. Treble clef euphonium parts transposing down a major ninth are included in much concert band music: in the British-style brass band tradition, euphonium music is
Tuba lowest pitched tubas are the contrabass tubas, pitched in C or B, referred to as CC and BB tubas respectively, based on a traditional distortion of a now-obsolete octave naming convention. The fundamental pitch of a CC tuba is 32 Hz, and for a BB tuba, 29 Hz. The CC tuba is used as an orchestral, and concert band instrument in the U.S., but BB tubas are the contrabass tuba of choice in German, Austrian, and Russian orchestras. In the United States, the BB tuba is the most common in schools (largely due to the use of BB sousaphones in