These trax use the Beatcomber sets of "no bass no drums," no bass no guitar," and "no drums no guitar" to isolate some of the instruments in the various Rockband songs. Pretty much done at random in the order I did them. There is some minor phasing and artifacting but most of it is covered up by mixing some of the instruments back in, so what you have is less an "isolation" and more of a "featured instrument" with other instruments in the background. The Abbey Road DLC songs came out the best.
Artwork, such as it is, is also included.
Just to be clear, the game hasn't been cracked and possibly never will be. These aren't moggs or stems or anything like that; they're cce'd and oopsed from Rockband recordings made with instruments missing; in other words, Beatcomber starts the drums but doesn't play anything, only presses the controller every few seconds to keep the song from stopping, and you end up with a stereo track without drums; repeat the process with guitar and bass, then with the combinations of 2, then with all 3