Activision has confirmed that Guitar Hero 5 DLC will not be compatible with Guitar Hero: World Tour. Guitar Hero: World Tour DLC is compatibale with Guitar Hero 5 though…
“Guitar Hero 5 downlodable content will be compatible with future Guitar Hero and Band Hero games. However, the advancements and innovations made to the franchise do now allow for downloadable content to be backwards compatible with Guitar Hero World Tour.”
Activision is so lame, they didn’t even bother to add trophy support for the PS3 version of GHWT.