We have been hearing rumors about a new service from Twitter over the last few weeks, Twitter Music, which is now official, and according to Twitter it is a new way to discover music.
The songs on Twitter #music currently come from three sources: iTunes, Spotify or Rdio. By default, you will hear previews from iTunes when exploring music in the app. Subscribers to Rdio and Spotify can log in to their accounts to enjoy full tracks that are available in those respective catalogs. We will continue to explore and add other music service providers.
Twitter music will be available from the app store today and Twitter have announced that they will also launch a web version at music.twitter.com.