So when I was referring to rock, as in modern rock that you always hear on the radio, it doesn't suit the bright animation. The loud guitar riffs and yelling, I could see how that would fit into action, but it still seems limited, with exceptions of course.
And when I mean rap, I meant gangster rap or something like that. I just can't picture it in an AMV, unless it's a parody lol. (ghettos and hoes)
HipHop is completely different, I'm a fan of it myself. It definitely worked for Champloo, and you see nice AMVs with it every now and again.
Bear with me though, I tried to emphasize that there are always exceptions! So I dunno why I was getting a barraged with examples.

I have a vast musical taste, I greatly enjoy one genre above all so I can't say I'm not bias towards certain genres. Though I wont judge an AMV by musical taste alone, it's just one of those things where it has to all add up.