If you finish the career mode you should have some sort of note come up after this guitar battle which will tell you some sort of unlockable - cheat button sequence. Otherwise you to go options -> cheats -> enter -> (GR) (B) (GR) (GY) (B) (GY) (RY) (O) (RY) (GY) (Y) (GY) (GR) - G being green, R being red, etc. You have to hold that fret down and strum, 2 frets in an enclosed bracket means 2 frets at once. Hope this helped!
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No, you can't earn cash on easy career mode, therefore, you can't access it
You have to play through career mode to unlock them
You unlock it at the Ozzfest venue in the career mode, it is just before the encore which is Crazy Train
The song is on all systems. It is an encore that you play in co-op career mode. I can remember which encore it is but I do know that. It is the final encore in coop mode.
By playing through the career mode or you just go to Quick play, Thanks for asking.