• Duration: 7'
• Instrumentation: 2[Picc.2] 1[EngHn] 2[1.BCl] 2[1.CBsn] — 4 0 0 0 — Perc Pno Harp — Strings
• Year: 1954
• Language of edition: eng, pol
• Type: parts, score, piano reduction

Serocki first wrote this ''Sonatina'' in 1954 in a version for trombone and piano and after twenty years, in 1974, he arranged it for trombone and orchestra. The piece represents an attempt to connect folk music motives and modern harmony. It is a highly virtuosic piece, showing the strengths of the trombone as a solo instrument, but the orchestra also plays an important role in it. The composition consists of three movements: 1. Allegro 2. Andante molto sostenuto 3. Allegro vivace.