Up 'til now, Twitter has been a great place to discover what's happening, what your friends are doing, and what everyone's talking about. But finding new music? Not so hot. Until today, that is. Twitter #Music ($Free) is a new official app that makes it easy to find what songs are trending, what artists are emerging, what the artists you follow are listening to, and what tracks your friends are digging. Just sign in with your Twitter account, link the app with Spotify or Rdio, and enjoy. Also, please note that denoting a song as "such a great track" is a pretty sure-fire way to ensure no one ever listens to it.