Im not too keen on the overall design.

For starters the colour scheme doesn't really scream music too me. I would have gone with dark red, browns etc. Also there isn't much hinting at the fact that its a music related site. Sure there is the header but the rest just doesn't really feel that musically. Maybe you could have the odd one or two musical notes in the background. Furthermore there is a large amount of text which I'm sure most people will get bored of reading, I certainly would. I know its just a mockup but include some photographs/images. As is obvious you are using flash, if possible you should try and include some kind of animation which is ongoing in the background, as well as some music. Since it is after all a music site it would seem fitting.