Backstreet Boys are a American vocal group, formed in Orlando, Florida in 1993. They rose to fame with their debut international album, Backstreet Boys (1996) and to superstardom with Millennium (1999). The band originally had 5 members - A. J. McLean, Howie Dorough, Brian Littrell, Nick Carter and Kevin Richardson. Kevin was the one who left the band in 2006, to pursue other interests. Though Kevin has been known to shown up to sing with the band from time to time. And in October 2011, he stated he would love to perform with the group again on a more regular basis. The band is currently in studio recording a new album, (release late 2012), only time will tell what will happen.

Their style - Pop, pop rock, R&B, teen pop and adult contemporary. To sum it up, The Backstreet Boys have sold over 130 million records worldwide, making them the best-selling boy band of all time. According to Billboard, they are the first group since Sade to have their first seven albums reach the top 10 on the Billboard 200.

Information was found at wikipedia