Five exploded onto the UK charts (and into the hearts of an army of fans) in the late ‘90s, armed with a sound like no boy band before them. Fusing high-energy gang vocals, hip-hop-inspired beats and a Technicolor approach to styling, they were Take That's cheeky cousins, Boyzone with better hair, *NSYNC with a healthy dose of street cred. Mega hits like “Slam Dunk (Da Funk)” and “Everybody Get Up”—with their party-starting lyrics and slamming pop hooks—cemented the group's standing as dance-floor favourites, while “When the Lights Go Out” showed the boys at their most seductive.