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 Sweetheart", "My Wild Irish Rose", etc.) Every member receives a booklet upon joining the society. The purpose of this collection is so that whenever any barbershoppers meet they will always have something ready to sing. The society has also published collections such as "Strictly Barbershop". Harmony Foundation International, a 501(c)(3) not-for-profit organization, was incorporated in 1959 as a charitable subsidiary of the Barbershop Harmony Society; it raises financial support for the society's programs. In 2003, in preparation for a new headquarters location, the Society sold both Harmony Hall, a historic lakefront mansion in Kenosha, Wisconsin, and its nearby facility (known