Sony BMG announced earlier this week its intent to drop DRM from its music, albeit making consumers jump through hoops to get the unrestricted songs. But it turns out Sony did partner with an online music store to offer its catalog in the unencrypted format after all, and that partner is no other than Amazon.

This means that Amazon MP3, which only sells DRM-free songs, now has deals with all four major music labels and is legitimately poised to take on Apples iTunes Store. Like the rest of the music available on Amazon MP3, Sony BMGs files will be available in a 256 Kbps MP3 format for $0.89 or $0.99 and will work on virtually any computer or portable player including the ubiquitous iPod.