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 quartet below the lead singer. Quartets can be male or female, but are generally not mixed male and female. A female barbershop quartet may be referred to as a Sweet Adelines quartet (taking the title from the barbershop classic "Sweet Adeline"), and the vocal parts have the same labels, since the roles perform similar functions in the quartet even though the vocal ranges are different. Most barbershop quartets are male. Barbershop singing originated in the late 1800s and early 1900s of America, a hybrid of both black and white expressive cultural forms at the time. The African-American influence is sometimes overlooked,