Let me restate the question. How many isolated games would meet the following criteria?
1. It has good music.
1b. It has enough songs to make a reasonable bracket out of.
2. It is well-recognized.
2b. People would vote on it, and not just the VGM crowd.
I have a funny feeling you'd have to resort to series, since very few games would fill both requirements, if any at all. None of the games I've heard mentioned so far have a deep enough tracklist to meet 1b, except maybe Xenogears which I'm not familiar with, which kinda means it doesn't meet the second criteria. However, the Best Umineko song contest nominations went up over a month ago, and iirc they're still looking for participants, though Umineko easily clears the first hurdle. In other words, that second condition is vital.
In any event, I've got two projects going right now -- this and the classic games list. When Diablo comes out, I will probably stop being bored, so while I don't mind trying to help the group decide what would be the next best candidate, I don't intend on running it.