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
Metropolis (barbershop quartet) Far Western District Champions, on May 9, 1998, Metropolis earned the Harmony Sweepstakes' Grand National A Cappella Championship - the first barbershop quartet to do so in the history of the event - and in 1999, the Contemporary A Cappella Recording Awards (or CARAs) nominated Metropolis' CD "Aural Hygiene" for "Best Barbershop Recording" and "Best Barbershop Song". In 2002 in Portland, Oregon, Metropolis earned a Bronze Medal in the Barbershop Harmony Society's International Competition and repeated this achievement in Montreal, Quebec in 2003, Louisville, Kentucky in 2004, Salt Lake City in 2005 and again in Indianapolis, Indiana in 2006. The