Depending on how the Audiosurf tracks are created, those could also be "fingerprints" to determine if the songs are the same. That's the other thing that annoys me (when people have a completely different Audiosurf track from everyone else and they're on the scoreboard).
It's too "precise" it would need to be fuzzied in some manner for this to work properly, otherwise we'd get a couple of scoreboards for the pirates, one for the FLAC users and almost everyone else would be on their own depending on what program/settings/format they used to encode the track. I don't doubt the fuzzying is possible, but it would be a lot of work.
The thing is, if everyone used musicbrainz, then all these extended mixes or live versions would be marked as such in the title, or at the very least, in the album. Does Audiosurf use the album information?
MusicBrainz fails horribly on quite a lot of my tracks. In many cases it simply doesn't know, in the extreme case it places it in a completely different genre with a completely different artist.
It's possible it could be used for "hinting", that is, if MusicBrainz looked the track up and reported a different tag, then the user could be asked. Or a button could be added on the loading screen for optionally looking the track up maybe.
It could potentially be separated into different album versions (provided that people actually have their crap tagged properly).
Often the problem is different tagging styles. Not everyone wants their tracks tagged the same way.
Take the Final Fantasy example earlier in the post. Some people won't care, but equally they'll be some with each of those tags that will insist that's the best way of tagging them.
It could still be an option to group them all together by name so that people who don't care would see the scores exactly as they are now, but I'd rather group them by who is playing the exact same song rather than by who is using the same name on their mp3 (which may or may not even be the same song).
I suspect this would require significant changes to the scoreboard system, which is something Dylan has been extremely reluctant to do.
Also it makes it very difficult to work out dethroning. Do you send an e-mail for the "don't care" scoreboard or the "precise" one you like?