Illegal, anyway, unless they can get away with “Fair Use” claims in the era of corporate law: this guy on YouTube has gone through Beatles recordings isolating Ringo Starr’s drum tracks and posted several on YouTube. Me, I think this totally qualifies as educational. He’s also isolated a couple of McCartney’s bass lines and some other bits, but the drums are more interesting, at least to me. Check it, before they go away; he’s been doing this for a few months now, but word is starting to get around, and who knows whether Apple Records will put up with this.