I just ran across one of the best homebrew games I've ever played. I have had it for an hour and haven't been able to stop yet. If you haven't checked it out yet, I would definitely suggest it, I am running it flawlessly on 3.90 m33-3 on a slim.
it is very difficult, but it's addictive as hell. i wore out both of my extended life batteries before i had to stop to charge them. i had problems with guitar hero at first too though.
could be way better. i have a game caleld tap tap revolution on my iphone with a Guitar hero theme and it looks just like it.
iphone can get it like this
but psp that has had homebrew for years only has that.
if you use 7zip to unpack them, you will get all of the songs, i ran into the same problem at first. sorry, i probably should have mentioned that earlier.