Seventy Six Trombones- easy Trombone Trio (Bb treble clef) for Trombone,Brass Trio written by Meredith Willson. The format of this sheet music is Score,Set of Parts and it’s published by James Brady Music. Seventy Six Trombones- easy Trombone Trio (Bb treble clef) is part of the following sheet music categories: N.