The surprise success of "Guitar Hero" readily led to the development of a sequel for the game. According to developer John Tam, the team felt they "hit the sweet spot" of genres and decades within the set list and wanted to maintain that for the sequel. The costs of obtaining licensing rights for music from "big bands" such as AC/DC, Led Zeppelin, Van Halen, and Metallica, in addition to the lack of understanding of how the music would be used prevented these groups from being used in "Guitar Hero". However, Tam notes that with the success of "Guitar Hero", "They understand that we're not going to embarrass their music, we're going to actually pay homage to their music and get it to the point where people are going to fall in love with their music and understand their music in a totally different way than they've ever experienced it before." They also had requests by artists to include master tracks within the game.