How do I take the vocals out of my limewire music and turn them into karaoke versions?

For that you would need a very expensive program that isolates one stream of sound from another i.e. the voice frequency from the beat frequency. This is very expensive technology which I doubt you could afford. However a simpler thing to do is to search for a song without the instrumentals i.e. type in "song name vocals". This may work for some songs. But I honestly don't know.