There’s a new music-related-service for Twitter, 
♬.ws. The basic premise is that you can enter the name of a band, and you’ll get a page with info on the band, a listing of relevant tweets, and links to iTunes, Amazon MP3s, and Musebin (a website of one-line music reviews and, not incidentally, the creators of ♬.ws). But the big advantage to the memorable-but-annoying domain name is a very short URL for your query, which can be embedded directly into a tweet (in lieu of a hashtag, for example).
I beta-tested it with two z=z faves, The Motion Sick and Logan 5 and the Runners. The Motion Sick worked pretty well, with only one nausea-related false positive. I was less successful with L5R; their album name, Featurette, hit lots of non-music-related tweets.
It’s an interesting concept, but I think it still needs some work. It’d be great if it also gave website and Myspace pages for the artists. And I hope they redesign the results page – I’d happily trade the 18-pt type and ugly Roman font for more tweets on a page and something more legible.
zed equals zee 