Hi Im'm the person who posted this question, and I just got Guitar Hero 2 today. So this question might as well be delleted and rot in all powerful cyberspace!!!!!!!!! ( and to answer my own question... they still make it)
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No. You have to have a guitar (Can be "Rockband" or "Guitar Hero" guitar or a drum set.)
i did not think you can. the software between the ps2 and ps3 are not the saw
Yes, starting with Guitar Hero: Aerosmith.
It depends, if you are playing this on an early PS3 (20 or 60gb) which still contains the PS2 backwards compatibility, it might work. Otherwise it won't work on your PS3 and last I checked you can't use PS3 guitar hero controllers on a PS2, even though it has USB ports.
Sadly you cannot... the makers of guitar hero actually didn't know ps2 was online so they made the ps2 version with no online access.