Barbershop harmony is a style of unaccompanied singing with three voices harmonizing to the melody.
The voice parts are called the tenor, lead, baritone and bass. Characteristically, the lead sings the melody, the tenor harmonizes above and the baritone and bass harmonize below. The style is distinguished by uniformity of word sounds and a special emphasis on close harmony. Tuning is as nearly perfect as is vocally possible. On July 2nd there will be five or more groups, and some single performers.