Boyz II Men
Boyz II Men is an American R&B vocal group best known for emotional ballads and acappella harmonies. This group is a trio, featuring baritone Nathan Morris alongside tenors Wanya Morris and Shawn Stockman. In the 1990s, Boyz II Men found fame on Motown Records as a quartet, but original member and bass singer Michael McCary left the group in 2003 due to health issues.
source: Wikipedia