Anthymn
This, if it works (and that's a big "if" I know) would be the best thing evar. I loved Loom precisely because of its music gameplay and an MMO built along similar lines would scratch just about every entertainment itch I have. Unfortunately, at this point, the Kickstart looks doomed to failure, with not even a tenth of the goal met halfway through. However, the prospect is awesome enough to make me pony up the dough anyway and hope it catches fire.