The Backstreet Boys are a Grammy-nominated American boy band. They were the first group launched by boy band mogul Lou Pearlman, and have been together since April 20, 1993.[2] They have had 13 Top 40 hits on the Billboard Hot 100 and have sold over 100 million albums,[3][4] making them the best selling boy band of all time. After returning to the music scene in 2005, their sound changed dramatically, incorporating only live instruments (some of which they play themselves) and a more guitar and piano driven pop rock sound.