So it turns out if you own Guitar Hero 3 and want to play Rock Band solo, there is no need to fork out for the expensive game and guitar, because you can use your ‘Les Paul’ from Guitar Hero 3 in the Rock Band game, but alas, if you are a Rock Band player, your luck is out if you think you can use your ‘Stratocaster’ in Guitar Hero 3…

Suckers who bought that game first!!!!
And contrary to most peoples belief, Guitar Hero 3 is an absolutely awesome game!

If you want to see the rest of the compatibility test, then head over to Joystiq for the full test.