According to Billboard, Pepsi and Amazon may start a promotion campaign during the upcoming Super Bowl that could give away as many as one billion MP3 tracks. It is also rumored that Wal-Mart will soon drop DRM-protected tracks in favor of the MP3 format. In reaction to these developments and the current availability of MP3s from EMI and Universal Music Group (this is a test), the Warner Music Group and Sony BMG Music Entertainment may consider distributing MP3s as well.
Read more about it at "Amazon 1 Billion MP3 Giveaway Offer; Under Pressure, Labels Warm To DRM-free Format" and "DRM Deathwatch: Sony, Wal-Mart."