Barbershop quartet singing | History, Harmony & Performance
https://www.britannica.com/art/barbershop-quartet-singing
WEBBarbershop quartet singing, typically all-male or all-female popular choral form characterized by a capella singing, with three voices harmonizing to the melody of a fourth voice. The emphasis is on close, carefully arranged harmony, synchronization of word sounds, and the use of such devices as.
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