I managed to get my hooks into a "multitrack" of Don McLean's American Pie. The upside is it's the original 1971 hit, the downside is it's not a true multitrack.... all vocals on one stereo track, both guitars on one MONO track , drums separated into 4 tracks, but sounds like there's been some digital manipulation to accomplish that. Piano track is nice wide stereo but has percussion on top of it. Bass is separate. I might be able to do something with this, just don't expect stellar separation with clumsy pre-mixing like this.