a barbershop quartet的用法和样例：
- A barbershop quartet that is used to singing in front of a pair of area mikes notwithstanding, a good sound man can make or break your group.
- He joined a barbershop quartet.
- he joined a barbershop quartet; the foursome teed off before 9 a.m..
- She opened up a barbershop of her own.
- My father and brother both work in a barbershop .
- Is there a barbershop near here?