New answers tagged clefs
The answer here is simple: To clear up any misconceptions about low brass: Euphoniums, tubas, and trombones are considered non-C non-transposing instruments. In other words, their fundamental pitch is not "C" (Bb, Eb, F, or C) but in bass clef, they read concert pitch. Now to answer the question directly: Baritones / euphoniums are written also in ...
The premise of your question is a little off, as not all treble and bass cleff instruments have Bb and C transpositions respectively; however, we can ask why euphonium parts specifically ended up being written with two different transpositions. (As a euphonium player myself, I always found this rather vexing.) Originally, euphonium music, even in bass ...
I don't think there's any reason other than historical chance. Might as well ask why string parts jump from one clef to another (just ask us cellists!). Sometimes it avoids ledger lines, sometimes not; alternatively look at clarinet parts which often go a large number of ledger lines above or below the staff, but never is a different clef used.
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