A barber-shop quartet男声四重唱
N-UNCOUNT（不可数名词） Barbershop is a style of singing where a small group of people, usually men, sing in close harmony and without any musical instruments accompanying them. 男声小合唱; 小型(男声)无伴奏和声演唱团 [oft N n]
...a barbershop quartet.
...一个男声四重唱组合。
N-COUNT（可数名词） A barbershop is a place where a barber works. (男性)理发店 [美国英语]