From the Twitter blog:
Today, we’re releasing Twitter #music, a new service that will change the way people find music, based on Twitter. It uses Twitter activity, including Tweets and engagement, to detect and surface the most popular tracks and emerging artists. It also brings artists’ music-related Twitter activity front and center: go to their profiles to see which music artists they follow and listen to songs by those artists. And, of course, you can tweet songs right from the app.
The new app isn’t available on the App Store yet (tip: to check, refresh Twitter’s page in iTunes using CMD+R). Twitter #music will launch with direct support for iTunes previews, plus Rdio and Spotify streaming for users who have accounts on those service. I’m interested to see how Twitter will handle the login process for Rdio and Spotify, but based on what I’m reading, it sounds like a good idea. Maybe Twitter does have the network infrastructure and willingness to do social music right.