Backstreet Boys
Whether you preferred NSYNC to them or not, the Backstreet Boys (AJ McLean, Howie Dorough, Nick Carter, Kevin Richardson, and Brian Littrell) were the OG boyband of its generation. Forming in 1993, they released their first album in 1996 and had success in Europe before rising to stardom in the US. The group took a hiatus in 2002, but reunited in 2004 to continue to tour and make music. In 2006, Richardson chose to leave the group, but rejoined in 2010, and they have continued to work together ever since. They even had a Vegas residency!