Billboard.com reported that Guitar Hero IV would be built on Aerosmith's music, it seemed--no offense to the band--like a step backwards. There is some room for misinterpreting the report, but not a whole lot.
"Besides the album, Aerosmith is also working closely with the makers of Guitar Hero IV," the article states, "which will be dedicated to the Boston group's music. 'I don't know much about the technical part of it,' Perry says, 'but artistically we're working hand in hand.'" (Emphasis added.)