Barbershop music in tags or codas, or when some appropriate embellishment can be created. One characteristic feature of barbershop harmony is the use of what is known as "snakes" and "swipes." This is when a chord is altered by a change in one or more non-melodic voices. Occasional passages may be sung by fewer than four voice parts. Barbershop music is generally performed by either a barbershop quartet, a group of four singers with one on each vocal part, or a barbershop chorus, which closely resembles a choir with the notable exception of the genre of music. According to the Barbershop Harmony
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