This is a couple days old, but according to a
rumor on Kotaku, Def Leppard will get three tracks onto the playlist for Guitar Hero IV. The rumor originates from an as-yet-to-be-released
Rockline interview with guitarist Phil Collen, who supposedly mentions that 'Photograph', 'Rock of Ages' and 'Animal' will appear on GH IV. However,
1Up speculated that the three tracks mentioned by Collen may actually show up on GH III as DLC based on past trends for releasing songs.