W.A. Mozart's 3rd Horn Concerto performed on alto trombone:

Prince Edward Island composer F. Jane Naylor's Be Strong and Strengthened for trombone and piano (sheet music available here):

Nexus percussionist Bill Cahn's Sonata for Trombone and Three Percussion:

Polish composer Zygmunt Stojowski's romantic Fantasie, Op. 27 for trombone and piano:

Canadian composer Elizabeth Raum's Fantasy for trombone and piano:

Norwegian composer Arne Nordheim's The Hunting of the Snark for solo trombone:

Beethoven's 12 Variations on a theme from Handel's "Judas Maccabeus" for trombone and piano (originally for cello):

Moravian Baroque composer Gottfried Finger's Sonata for alto trombone and piano: