four performers or singers who perform together
a set of four similar things considered as a unit
four people considered as a unit; "he joined a barbershop quartet"; "the foursome teed off before 9 a.m."
a musical composition for four performers
Quartette is a Canadian country-folk group featuring Cindy Church, Caitlin Hanford, Gwen Swick and Sylvia Tyson. Each of the four members also records as a solo artist in addition to their work as a group.