Unlike almost all of their peers, the Backstreet Boys never broke up — though original member Kevin Richardson did quit in 2006.
The New Kids On The Block reformed in 2008 for a highly successful reunion tour. Next year they're hitting the road with The Backstreet Boys for what's been dubbed the NKOTBSB tour.
The last time the five members of N'Sync appeared together in public was at the *NSYNC Challenge For The Children in 2005. After the game Justin Timberlake informed the group he was leaving. They decided to break up rather than carry on without him.
Bottom from left: Ashley Parker Angel with Hairspray castmate Aubrey O'Day in New York City, 2008; Jacob Underwood in Park City Utah, 2004; Dan Miller in 2007; Trevor Pennick in Hollywood, 2006; Erik Michael Estrada in Hollywood, 2009.
Robbie Williams rejoined Take That in 2010. Next year they are launching a sold-out stadium tour in the U.K.
The group continues to tour regularly, but in 2003 original member Michael McCary left due to chronic back problems. They opted to not replace him and they now tour as a three-piece.
The Monkees were the best-selling band of 1967, outselling even The Beatles. They reformed periodically in the past three decades, but usually without guitarist Mike Nesmith.
Bottom from left: Bryan Abrams in 2007, Kevin Thornton in 2008, Sam Watters in 2009, Mark Calderon.