Official X-Box Magazine Disc #42 Cheats - Xbox
Primary Collection of Cheats
MTV Music Generator 3: This is The Remix demo
Hold L and press [Black], [Back], [A], [Left], [A], [Right], [Down], [B], [A], [Right], [B], [Up], [B]x2, [A], [Start], [Black] at the main menu. Note: Be careful not to press [Back] while playing the demo or it will return to the main menu.