About A Cappella
Voices-only? Music without instruments?
A cappella typically refers to vocal music that is sung without instrumental accompaniment. Traditionally, a cappella pieces are polyphonic, have 1-2 singers on a part, in 4-6 parts, and performed in a convivial manner. In the 20th century, a cappella came to describe amateur group singing popular songs in a newer, "contemporary" style that features singers imitating rock band and orchestral instruments alongside more traditional singing practices.