Well, everyone is going to get upset that you have a "register" popup. Just are warning.
As far as the styles go..
From my point of view, I get a very "cluttered" feeling, and I don't know why. I think it may be the background image.. I get a little confused on some pages seeing the navigation in four different areas as well. I'm not too fond on the ".: :." things around the links, but that's just pickyness of mine, and there are quite a few alignment issues I ran into.
As far as the website goes:
I'm really confused all together. Are their multiple forums set up on here? I ran into both a vBulletin, and a WowBB by clicking the "forums" link. Also a few different registration pages.. That much stuff without a more cleaned up navigation is going to throw people off gaurd and possibly scare them away.
Also, upon visiting the site, I'm a little unsure of what the purpose of it is. Obviously something to do with music/artists. I don't know how you would go about it, but the charts page is very long. I think just a tad bit too many genres for just starting out if you know what I mean?
The site has the potential to make it big, no doubt about it. And there's no doubt that you haven't spent a lot of time on it, but there's just confusion with everything there that I think will make it harder for the site to take off.
I hope that helps? And sorry if I come off as a jerk, it's not intended.

Good luck.