chamber music, Kammermusik [G], musique de chambre [F], musica da camera [I], musica cameralis [L]—"Classical Music" for a small ensemble, generally 8 or fewer players with a canonical emphasis on 3-6 players. explore
oboe quartet—ensemble/work for oboe and strings, typically the traditional string trio comprising violin, viola, and cello. Note, "oboe quartet" might also refer to a quartet of oboes, but the frequency of this quartet for oboe and strings warrants the traditional name. Explore the oboe quartet | wiki
quartet, quatuor [F], quartett [G], quartetto [I], cuarteto [S]—ensemble or work for four players the most important examples being the string quartet and the piano quartet
sonata [I], sonate [pl], suonato—Originally, "sounded" rather than "sung" (sonar vs. cantar), i.e. instrumental music. According to historical period, sonata began to imply a formal plan of movements as well as the structure within a single movement, e.g. "sonata form" and applies to instrumental sonatas, string quartets, symphonies, etc., all examples of the sonata principle. In general usage as a specific work title (e.g. violin sonata), it designates a multi-movement piece for solo or duo instruments with one of the instruments enjoying a feature role. wiki
string trio, Streichtrio [G], Trio d'archi [I], Trio à cordes [F], Trío de cuerdas [S]
—a work for three stringed instruments, most commonly violin, viola, and cello. A more rarefied form than the string quartet, perhaps because the texture is sparse (each instrument highly exposed) and the means are more difficult for natural harmonic richness. But these become challenges and assets in the great trios. Trios almost always emphasize countrapuntal writing with each of the three players in strong relief. Explore the string trio | wiki