There are many different synonyms for the phrase "singing group", depending on the style of music and the number of members. A choir is a type of singing group made up of many voices, often used for religious or classical music. An a cappella group sings without instrumental accompaniment, while a vocal ensemble usually has fewer members and focuses on harmonizing. A barbershop quartet is a specific type of group made up of four male singers, while a girl group typically features young women singing pop or R&B. There are also vocal bands, choral societies, and glee clubs. Whatever the style or format, singing groups bring people together to make beautiful music.