Aclarinet–viola–piano trio, often titled "Trio for Clarinet, Viola and Piano" is a work ofchamber music that is scored for clarinet, viola, and piano; or is the designation for amusical ensemble of a group of three musicians playing these instruments. This combination of instruments differs from other combinations, as the viola and the clarinet share approximately the samemusical range, but not the sametone quality.

The Austrian composerWolfgang Amadeus Mozart was the first to write for this combination of instruments with his"Kegelstatt" Trio, K. 498 (1786). which helped to popularize the clarinet in classical music. German composersRobert Schumann andMax Bruch also wrote early pieces for the clarinet, viola and piano; the combination has been increasingly written for during the modern era.

A clarinet–viola–piano trio, or trio for clarinet, viola and piano is a work ofchamber music written for amusical ensemble consisting of a viola player (or violist), a clarinettist, and pianist. The termclarinet, viola and piano trio is also used as a description of these musicians.

This combination of instruments differs from the traditionalpiano trio instrumentation—for piano, violin and violoncello—and other combinations, such as forclarinet–violin–piano trio and theclarinet–cello–piano trio, as the viola and the clarinet share roughly the samemusical range. The combination of viola and clarinet is distinguished by thetone quality of the instruments rather than by theregister (i.e. the height of the pitch), as with a violin compared with a 'cello'.

The Austrian composerWolfgang Amadeus Mozart was the first to write for this combination of instruments with his"Kegelstatt" Trio, K. 498 (1786). Mozart's Trio, along with hisClarinet Quintet, K. 581 (1789) andClarinet Concerto, K. 622 (1791), were written when the clarinet was a relatively newly invented instrument. The three compositions featured the clarinet and were responsible for popularizing the instrument's use in chamber and orchestral works. German composersRobert Schumann (1810–1856) andMax Bruch (1838–1920) also wrote for the clarinet, viola and piano.

Works scored for clarinet, viola, and piano have gained increasing popularity in the modern era. The repertoire includes:

Although not originally intended as a chamber music work, the works of several composers who have writtenconcerti for viola and clarinet have been arranged for a trio with the orchestral part condensed and arranged for piano. Notably, theDouble Concerto for viola, clarinet and orchestra, Op. 88 (1911) of Max Bruch has been arranged for viola, clarinet and piano. Other concertos with these solo instruments include a concerto byAulis Sallinen andAlternatim (1997) byLuciano Berio.

• Johannes Brahms:Seven Piano Piecestranscribed by Paul Rosenbloom:Capriccio in F♯ Minor, Op. 76, No. 1;Intermezzo in B Minor, Op. 119, No. 1;Intermezzo in E Minor, Op. 119, No. 2;Intermezzo in A Major, Op. 118, No. 2;Intermezzo in A Minor, Op. 116, No. 2;Intermezzo in C Major, Op. 119, No. 3;Capriccio in G Minor, Op. 116, No. 3
• Edmund Neupert:Three Miniatures, Op. 26, Nos 1-3transcribed by Paul Rosenbloom:Resignation; Elegy; Scherzo
• A Romantic Love Triangle: Three Romances,transcribed by Paul Rosenbloom:Clara Schumann:Romanze in A Minor, Op. 21, No 1;Robert Schumann:Romanze in F Major, Op. 28, No 2;Johannes Brahms:Romanze in D Major, So laß uns wandern, Op. 75, No 3

• Piano trio repertoire

• Clarinet–viola–Piano Trios: Scores at theInternational Music Score Library Project

• Chamber music
• Classical music trios
• Compositions for clarinet trio
• Compositions for viola
• Compositions for piano
• Types of musical groups

• Works with IMSLP links
• Articles with International Music Score Library Project links