Amazon.com has announced that it will be adding music from Sony BMG to its Amazon MP3 DRM-free music store later this month, which will make it the only service to offer DRM-free tracks from all four major labels. “We are excited to offer Amazon MP3 customers DRM-free MP3s from SONY BMG, which represents many of the most popular musicians from the past and present,” said Bill Carr, Amazon.com Vice President for Digital Music. “Our Amazon MP3…
