This song is on Guitar Hero: Warriors of Rock where it is used within the game's storyline (four band warriors find Demigod's Battle Axe Guitar and must play all parts of "2112" on basic controllers).
It was made available to download on December 31, 2011 as both 3 pieces and as the complete 20-minute track, for play in Rock Band 3 Basic, and PRO mode which utilizes real guitar / bass guitar, and MIDI compatible electronic drum kits in addition to vocals.