Chamber music
a quintet is a piece for five instruments. A string quintet can be for two violins, two violas and cello (e.g. Mozart’s string quintets) or it can be for two violins, viola and two cellos (e.g. the one by Schubert). A piano quintet is for piano and string quartet (although Schubert’s Trout Quintet is unusual: it is for piano, violin, viola, cello and double bass).