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 arranging advantage. A music category judge can assess an arrangement by ear or eye to test whether it is 'barbershop', and hence valid for use in competition. The BHS and its affiliated associations run courses in arranging at 'Harmony University' (formerly 'Harmony College'), which are open to members. Relevant manuals: "Theory of Barbershop Harmony", "Barbershop Arranging Manual" and "Contest and Judging Manual" are published by the BHS. Barbershop arranging Barbershop arranging is the art of creating arrangements of barbershop music. The Barbershop Harmony Society (BHS) and Sweet Adelines International (SAI) have prescribed rules that dictate what is an acceptable arrangement, particularly