With superstars like 'N Sync, Backstreet Boys and the Spice Girls dominating the airwaves throughout the late '90s / early '00s, it's easy to forget about some of their pop counterparts from that era... Who seemed to really dig the whole numerical, acronym thing when it came to their names.

Here, we pay tribute to boy bands like O-Town and LFO, as well as girl groups like 3LW plus many, many more. Check out these unsung heroes of the radio circa the new millenium, and click through the song links to travel back in time with these bands.