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.

O-Town
From:
Orlanda, Fla.
Years Active:
2000-2003, again for a hot sec in 2011? Maybe?
Members: 
Jacob Underwood, Ashley Parker Angel (<3), Erik-Michael Estrada, Trevor Penick, Dan Miller
Biggest Hits:
'Liquid Dreams,' 'All or Nothing,' 'We Fit Together'
Deep Cuts: 'Every Six Seconds,' 'These Are the Days'

S Club 7
From:
The mind of Simon Fuller / All over the U.K.
Years Active:
1999-2002, Several Lineup Changes Since
Members:
Tina Barrett, Paul Cattermole, Rachel Stevens, Jo O'Meara, Hannah Spearritt, Bradley McIntosh, Jon Lee. 
Biggest Hits: 
'Never Had a Dream Come True,' 'Bring It All Back,' 'S Club Party'
Deep Cuts: 'Don't Stop Movin',' 'Have You Ever'

3LW
From:
Newark, N.J.
Years Active:
1999-2007
Members:
Adrienne Bailon, Kiely Williams, Naturi Naughton (1999-2002), Jessica Benson (2002-2007)
Biggest Hits:
'No More (Baby I'ma Do Right),' 'Playas Gon' Play,' 'I Do (Wanna Get Close to You)'
Deep Cuts: 'Is You Feelin' Me,' 'Neva Get Enuf'

LFO (aka Lyte Funky Ones)
From:
Fall River, Mass.
Years Active:
1995-2002
Members:
Brad Fischetti, Rich Cronin (R.I.P.), Devin Lima (1999-2002), Brian Gillis (1995-1999)
Biggest Hits:
'Summer Girls,' 'Girl on TV,' 'Every Other Time'
Deep Cuts: 'I Don't Want to Kiss You Goodnight,' 'West Side Story'

5ive
From:
London, England
Years Active:
1997-2001, 2013 Reunion!
Members:
Abz Love, Ritchie Neville, Scott Robinson, Sean Conlon, J Brown (1997-2001)
Biggest Hits:
'When the Lights Go Out,' 'Slam Dunk (Da Funk),' 'It's the Things You Do'
Deep Cuts: 'Everybody Get Up,' 'If Ya Gettin' Down'

702
From:
Las Vegas, Nev.
Years Active:
1994-2003
Members:
LeMisha Grinstead (1994-2003), Irish Grinstead (1994-2003), Kameelah Williams (1994-2001, again in 2003) + More
Biggest Hits:
'Where My Girls At?,' 'Get It Together'
Deep Cuts: 'Steelo,' 'All I Want'

B*Witched
From:
Dublin, Ireland
Years Active:
1998-2002, 2013 Reunion!
Members: 
Lindsay Armaou, Edele Lynch, Keavy Lynch, Sinéad O'Carroll
Biggest Hits:
'C'est la Vie,' 'Rollercoaster'
Deep Cuts: 'Blame It on the Weatherman,' 'To You I Belong'

BBMak
From:
London, England
Years Active:
1997-2003
Members: 
Mark Barry, Christian Burns, Stephen McNally
Biggest Hit:
'Back Here'
Deep Cuts: 'Out of My Heart (Into Your Head),' 'Still on Your Side,' 'Ghost of You and Me'

Dream
From:
Los Angeles, Calif.
Years Active: 
1998–2003
Members: 
Holly Blake-Arnstein, Ashley Poole, Diana Ortiz, Melissa Schuman + More
Biggest Hit:
'He Loves U Not'
Deep Cuts: 'This Is Me (Remix),' 'Crazy'

soulDecision
From:
Vancouver, Canada
Years Active: 
1993–2005
Members: 
Trevor Guthrie, David Bowman, Ken Lewko, James Reid (2004-2005)
Biggest Hit:
'Faded'
Deep Cuts: 'Ooh It's Kinda Crazy'

All Saints
From:
London, England
Years Active:
1993–2001, 2006–2009
Members:
Shaznay Lewis, Melanie Blatt, Nicole Appleton, Natalie Appleton, Simone Rainford (1993-1995)
Biggest Hit:
'Never Ever'
Deep Cuts: 'I Know Where It's At,' 'Under the Bridge' (cover), 'Pure Shores'

B2K
From:
Los Angeles, Calif.
Years Active: 
1998–2004
Members:
Lil' Fizz, J-Boog, Raz-B, Omarion
Biggest Hit:
'Bump, Bump, Bump'
Deep Cuts: 'Gots Ta Be,' 'Girlfriend,' 'Uh Huh'

Blaque
From:
Atlanta, Ga.
Years Active:
1996–2009, 2012–present
Members:
Shamari Fears, Brandi Williams, Natina Reed (R.I.P.)
Biggest Hits:
'As If,' '808,' 'Bring It All to Me'
Deep Cuts: 'I'm Good,' 'I Do,' 'Ugly'

2gether
From:
The Minds at MTV
Years Active:
1999–2001
Members:
Jerry O'Keefe (aka "the Heartthrob," played by Evan Farmer), Chad Linus (aka "the Shy One," played by Noah Bastian), Jason 'Q.T.' McKnight (aka "the Cute One," played by deceased actor Michael Cuccione), Doug Linus (aka "the Older Brother," played by Chris Farley's brother, Kevin Farley), Mickey Parke (aka "the Bad Boy," played by Alex Solowitz)
Biggest Hits:
'U + Me = Us (Calculus),' 'The Hardest Part of Breaking Up'
Deep Cuts: 'Say It (Don't Spray It),' 'Before We Say Goodbye,' 'Every Minute Every Hour'

Cleopatra
From:
Moss Side, Manchester, England
Years Active:
1998-present
Members:
Cleo Higgins, Yonah Higgins, Zainam Higgins
Biggest Hit:
'Cleopatra's Theme'
Deep Cuts: 'I Want You Back' (cover), 'Life Ain't Easy'