Originally Posted by VoteLynnSwan
now i'd imagine if you could isolate the frequencies of the vocals alone, then it would be possible to eliminate them. Obviously that would be an extremely complicated process, and i'm sure there isn't software that's designed to do it.
Vocals typically span a large frequency range and in order to completely eliminate them you would also cancel out a large portion of the other instruments frequencies.
Most pro DJ's get individual instrumental tracks directly from the artist for remixing purposes.