Just saw this on JP's facebook page.
http://www.jammit.com/artist/judas-priest
You can purchase isolated tracks from songs. By that, I mean the vocal track, the bass, drums or guitar tracks. VERY cool for aspiring musicians or just for those of us that could appreciate the instuments separately.
According to the website, they will be adding a new song every week. I hope that when/if they do that, they continue to keep the older tracks.
My only question about this, is it the actual/original tracks, or is this something that some musicians are doing in a studio somewhere? I wouldn't have questioned it, until I saw Line6 on the right side of the guitar track, and I really doubt that JP used Line6 amps 30 years ago (doubt they even existed back then).