Can't be done with a Mastered CD. If your talking about a normal song on your computer, that cant be done because the song was mastered to TWO tracks... Left and Right. The only way to get those tracks would be to obtain the original DA tape of 24+ tracks of audio and then buy the tape machines to import them back into the computer... that is if you can get into the hig-security vault where most master tapes are kept.
Impossible.