Sony BMG has announced that songs from its library will be available as DRM-free MP3s through Amazon.com, reports Variety.

Sony becomes the fourth of the four major record labels to join Amazon's MP3 store. Tracks from the label will be offered without rights-management encoding, making them playable on just about any portable music player.

Sony just announced the creation of its own DRM-free online music store. Hopeful shoppers there, though, have to first visit a real-world store and buy a card that's good for a specific album and then redeem it online.