You might have seen from Google Talk, users have got option to share the music they are playing on their machine. Right now, following players are supported which means, talk will be able to read music data from following players.
- Windows Media Player
- Yahoo Music Engine.
Though, google promises to increase the number of player supported in future. I think jetaudio and real-player must be added first on this !! (I am the regular jet audio Pro guy !!!)