Quartet (Pat Metheny album)
WordNet
noun
(1) A musical composition for four performers
(2) Four people considered as a unit
"He joined a barbershop quartet"
"The foursome teed off before 9 a.m."
(3) A set of four similar things considered as a unit
(4) Four performers or singers who perform together
(5) The cardinal number that is the sum of three and one