A barbershop quartet is a vocal ensemble consisting of four singers who harmonize in a specific style. Typically, the group includes a lead singer, a tenor, a baritone, and a bass. This genre of music is characterized by its close harmonies and a cappella singing, often featuring songs from the early 20th century. Barbershop quartets often perform at community events, competitions, and festivals. The style emphasizes vocal blending and intricate harmonies, making it a unique form of entertainment. Many quartets are part of organizations like the Barbershop Harmony Society or the Sweet Adelines International, which promote this musical tradition.