Bass Trombone,Instrumental Solo,Piano - Digital Download SKU: A0.933903 Composed by William Pagan-Perez. Contemporary. Score and individual part. 14 pages. William Pagan-Perez #6367025. Published by William Pagan-Perez (A0.933903). This is an intermediate-level single-movement piece for bass trombone and piano. Good to play legato melodies in recitals, students concert, and more.