The Terzetto for flute, oboe and viola (H158), written by Gustav Holst in 1925 and first performed the following year, comprises two movements marked Allegretto and Un poco vivace.
[3] It was first performed publicly on 2 March 1926 at the Faculty of Arts Gallery, Golden Square, London by Léon Goossens (oboe), Albert Fransella (flute), and Harry Berly (viola).
[7] It was first published only in 1944,[11] and in 1978 was re-edited by Imogen Holst, the composer's daughter, both with the original instrumentation and in a transcription for flute, oboe and clarinet by R. James Whipple.
The second, marked Un poco vivace, is a mainly light-hearted scherzo, fugal with unobtrusive dance rhythms, though interrupted by more melancholy meno mosso passages; this movement culminates in arpeggios for all three instruments.
[2] This remark alludes to Holst's careful avoidance of dissonance wherever possible in favour of what has been called "a non-functional triadic harmony"[19] or "a composite tonality".