Site looks pretty cool, but one can get carried away with graphics. here's my take:
1. Like the header image, but here's two dislikes. One, I don't think you need to make the header height so large. You want to get your visitor down into the meat of your site. The header is sort of the teaser. Secondly the text in the header looks to have some sort of shadow effect, which makes this old man go google eyed, lol! I would use plain text without any highlights or shadows.
2. Your image based navigation menu on the left is impressive, but I think a bit overdone. Like your header, I would much rather use text based navigation, which will shorten it up to the top most portion of your page...or at least, make your buttons, smaller. An old and fast rule, is that most visitors will spend less than 5 seconds viewing your page to find something worth staying. You need to catch their attention quickly and get them to the meat of your page.
3. Your main title and subtitle are similar. Iwannabeinaband.com and Iwannabeinaband home page. You don't need both. Leave your header title as is and change your sub-title to tell your visitor what the site is about.
I got to head back to work, but that is what I see so far...Really a nice design.
Good luck with your site