I can't figure out how to get Free Bird. Is there a code or something?

Earn it

I know that! But there was a cheat

Enter this code at the main title screen to unlock all the songs in the PS2 version:

B,Y,O,R,O,Y,R,Y,R,Y,R,Y,R,Y

Those letters stand for the colors to press.

This is the one for the 360 version:

B,Y,O,R,Y,O,B,Y,B,Y,B,Y,B,Y,B,Y

Look you have to go buy it I think or you have to earn it

To unlock freebird in guitar hero 2 you have to beat the career mode on medium you get it as an encore for the last section of songs on medium