To find the extra hidden tracks you must play the career section on medium level or higher. Complete a certain number of tracks on each level to unlock your encore performance for the extra song/track.

Other songs/tracks can be bought from the guitar shop from the money you earn on career mode. Once you've bought your track & unlocked encore tracks can be played in Quick Play on any level setting.

If you have got coded cheats from another source you input them using your Gibson SG controller at the title menu using the coloured frets in the order of the coded (Y=yellow, O=orange, B=blue)

e.g.

Air Guitar mode

USA ver.
Y,Y,B,O,Y,B

Euro ver.
B,Y,O,B,Y,Y