nice site...music is fine but an off button is a must for music listeners and those who leave sites open in tabs. and if it doesnt remember with a cookie that you turned it off, remove it alltogether. if i like it enough to leave the tab open a lot the music feature would be enough to draw me away from visiting as frequently because the music never stops, and its just one more thing to click. at the very most i say a small, short, blip of music to introduce the site, and fade out. if you really want music, let us turn it ON not OFF.
on the moving main selection box, i have no problem with it, and once i saw how it reacts to the mouse i remembered and its easy to make selections. its odd, but not horrible. i just realised it moves to different places for different pages...i dont like that. you have to "adapt" for every new page...thats the drawback of flash. i think flash is neat but cereal makers and candy products/advertisement/contest sites use flash and they go overboard to make it a one-time-visit pretty site. dont do that. thankfully yours is simple enough. consistency is a good thing. if the page selector would move to the same spot every time (i.e. not to the top on the gallery page, but to the left like the other pages) it would be nice. think of it like the "user CP" link on SupraMania moving around the top of the site every time you moved to another page...i have a hard enough time finding it because i'm in so many slightly-different vBulletin based web forums....
great start though, i like it a lot. and the music is nice, because the loop has not annoyed me yet in the last 10 minutes. but i still dont think it should be kept.
color choice is nice.
BTW - this site reminds me a LOT of the NFS Porsche Unleashed game menus.
even the music....and the flashing...and the movement...WTF?? lol. did you get any ideas from there?