What IS Guitar Hero custom?

Well, in order to do this, the easiest way is to burn a 'custom' copy of the game. You pretty much disassemble and re-assemble Guitar Hero on your PC, and then burn a copy with your own files. I'm fairly certain it's unbelievably illegal, though. The biggest problem people have with this, is forcing their console to play a burnt disc. Some people use modded consoles in order to do so, but I used to use the independence exploit (and swap trick) in order to do it on ps2.