One bit of feedback after submitting a track: The list of genres to select from is too course-grained IMHO. There's a gazillion sub-genres of electronic dance music for example, but "Electronic" was as close as I could get. Genres like metal have the same issue. It doesn't matter so much now given the current UX, but if you consider others' suggestions on adding genre/sub-genre specific lists (which I agree with 100%), then I think you'll want to allow people to get as fine-grained as they want to (sub-genre lists could all bubble up to a parent genre list, and all of the steps in between). Submit Hub does this very well, if you're looking for examples/inspiration.
My two pennies. Good luck with the site!