Boyz II Men is an American vocal harmony group from Philadelphia, Pennsylvania, best known for emotional ballads and a cappella harmonies. Formed in 1985, they have been a trio composed of baritone Nathan Morris alongside tenors Wanyá Morris and Shawn Stockman since 2003. During the 1990s, Boyz II Men was a quartet with bass singer Michael McCary, who left the group in 2003 due to health issues that were diagnosed as multiple sclerosis.

Music performed a cappella, less commonly spelled a capella in English, is music performed by a singer or a singing group without instrumental accompaniment. The term a cappella was originally intended to differentiate between Renaissance polyphony and Baroque concertato musical styles. In the 19th century, a renewed interest in Renaissance polyphony, coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists, led to the term coming to mean unaccompanied vocal music. The term is also used, rarely, as a synonym for alla breve.