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 music in the United States were in the habit of using multiple initials to denote their function. The group adopted the alternate name "Barbershop Harmony Society" early in its history. While its legal name has never changed, it changed its official brand name to "Barbershop Harmony Society" in 2004. "Sharp Harmony", a Norman Rockwell painting, appeared on the cover of "The Saturday Evening Post" magazine issue dated September 26, 1936; it depicts a barber and three clients enjoying a cappella song. The image was adopted by SPEBSQSA in its promotion of the art. Traditionally, the word "barbershop" has been used to