noun
instrumental sextet
Refers to a musical composition for six instruments, or the ensemble itself. A technical term in classical music.
彼は弦楽六重奏曲を作曲した。
He composed a string sextet.
六重唱 is a vocal sextet (six singers), while 六重奏 is an instrumental sextet.
Compound of 六 (six), 重 (layer, multiple), and 奏 (play music). The reading is on'yomi throughout.