At the onset of development, the team did not have any idea of what songs would be present in the final game. Kay noted that "We wanted 30 or 40 songs for the game and put a hundred on our wish list." The game was to focus mostly on hard rock songs, but the team was limited by what could be licensed. The team also felt "morally obligated" to include older, classic rock songs like The Ramones "I Wanna Be Sedated" to the younger target audience of the game. Harmonix had to modify the track list throughout development as certain songs were introduced or removed based on licensing issues, requiring the team to repeatedly balance difficulty and popularity of the track list. WaveGroup Sound were used to create the covers of the licensed songs provided in the game. Marcus Henderson of the band Drist provided many of the lead guitar tracks for the covers. WaveGroup Sound also went to efforts to try to recreate effects for some songs. In the case of Black Sabbaths "Iron Man", the team learned that the vocal effects were created by having Ozzy Osbourne sing from behind a metal fan. The team sought out the same model of fan through Craigslist to generate the same effect in the game's cover. Many of the bonus songs were from groups that Harmonix employees were part of or knew. Additionally, a "Be a "Guitar Hero"" contest was held allowing bands to submit their own song to be included in the game. The winning song was "Cheat on the Church" by Graveyard BBQ. Black Label Societys song, "Fire it Up", was included two weeks before the game was completed at the request of Zakk Wylde. The final song list was set very near to the shipping date.