The Backstreet Boys are a Grammy-nominated male vocal pop group that enjoyed enormous success in the mid-late 1990s and 2000s. They have sold over 98 million albums worldwide, charting 12 U.S Top 40 hits on the Billboard Hot 100, 16 U.K. Top 10 hits and have won numerous awards, making them the highest selling boyband of all-time. Since returning to the music scene in 2005, their sound changed drastically, incorporating only live instruments (some of which they play themselves) and a rock edge. The now four-member group consists of Nick Carter, Howie Dorough, Brian Littrell, and A.J. McLean; original member Kevin Richardson left the group on June 23, 2006.