Fifty previously-unreleased Rolling Stones have surfaced on numerous band fan sites, including their Fan Club page, It's Only Rock 'n Roll.
Titled Fully Finished Studio Outtakes, it's believed the songs were being readied for an official archival release.
The songs were recorded during the '60s and '70s, and among them is the 1974 demo of "It's Only Rock 'n Roll" with David Bowie on vocals and Ronnie Wood on guitar before Woody joined the band.
The bootleg is also available on three CDs for $70.
The band has not commented on this story.