Apple has recently opened their DRM-free music store, named iTunes Plus, which not only sells music at a higher bitrate but also completely free of any “evil” DRM code.

These new tracks are only available for EMI artists, and will cost you an additional $0.30, as we already knew. If you already purchased tracks from EMI artists, you will have the option to upgrade the albums to a “Plus” version, however, for the moment, you won’t be able to upgrade individual tracks.

Ars, tried to upgrade some tracks they purchased on Windows machines and had some problems with it. My guess is that it’s because of the algorithm that checks if the track was purchased in the iTunes store or not, but that’s just my speculation. It will soon be fixed on an upcoming iTunes 7.2.1 or some other version similar to that.

In short, there are still some problems to iron out with the service. I just hope that once things are smoothed out the people will support this initiative and buy more music in this format, which might make other recording companies follow EMI’s lead.