Man power! Us looks back at music's most successful all-male groups, from One Direction to the Backstreet Boys
Just like how Ricky Martin's launching point was with Menudo, Robbie Williams got his start with this hot 90's Brit group. After he left in 1995, original members Gary Barlow, Howard Donald, Jason Orange and Mark Owen continued to release albums (selling 45 million worldwide) and tour as a foursome.
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