Octubafest Euphonium 1 Bass Clef Part Book – Tuba/Euphonium Quartet for Euphonium 1 written by Traditional. The format of this sheet music is Individual Part and it’s published by Norlan Bewley. Octubafest Euphonium 1 Bass Clef Part Book – Tuba/Euphonium Quartet is part of the following sheet music categories: Old-time.