A musical composition in four parts, each performed by a single voice or instrument.
A group of four musicians who perform classical music together.
A group of four singers, usually males, who sings together in four-part harmony.
A group of four people or things, particularly
A piece of music composed for six voices or six instruments; a sextet or sestuor.
The last six lines of a sonnet, forming two stanzas of three lines each.