Man power! Us looks back at music's most successful all-male groups, from One Direction to the Backstreet Boys
Boyz II Men
Nathan Morris, Shawn Stockman, Wanya Morris, Michael McCary and Marc Nelson are known for their soulful a capella and for being one of the most successful R&B groups to date. After breaking onto the scene in 1991 with their single "Motownphilly," they saw nine more singles reach Platinum and Gold certifications. Their most memorable duet is the 1995 song "One Sweet Day" with Mariah Carey, which was voted the No. 1 Best Collaboration of All Time in a Rolling Stone reader poll.