Barbershop music encompass both men's and women's singing in the barbershop style – in quartets and choruses. Sweet Adelines International and Harmony, Inc. are two women's barbershop singing organizations that operate globally and in North America, respectively. Other women's organizations include the Ladies Association of Barbershop Singers (LABBS) in the United Kingdom, the Spanish Association of Barbershop Singers (SABS) in Spain, and the Irish Association of Barbershop Singers (IABS) in Ireland. A barbershop quartet is an ensemble of four people who sing a cappella in the exacting barbershop music genre. In North America most male barbershop quartet singers belong to the Barbershop
Barbershop Harmony Society Wisconsin for fifty years before moving to Nashville, Tennessee in 2007. In June 2018, the society announced it would allow women to join as full members. A parallel women's singing organization, Sweet Adelines International (SAI) was founded in 1945. A second women's barbershop harmony organization, Harmony, Inc., broke from SAI in 1959 over an issue of racial exclusion, with SAI (like SPEBSQSA and many other organizations) being white-only at that time; SPEBSQSA officially lifted the requirement in 1963. Several international affiliate organizations, in countries around the world, add their own flavor to the signature sound of barbershop harmony. The original