Lord Borthbury <(Address removed)> said:

Been done manually
for many years to extract vocals from tracks.

Not overly successful. Although a good mix will have elements sitting at different positions in the frequency range there is also overlap. And that's before dealing with FX and reverb tails and such like. In short it's like trying to extract a bag of sugar back out from a cake.

Apart from that software Dave mentioned, I suppose the nearest is all they awful chart dance hits that sampled 70's and 80's tracks that were really popular a few years back, Call On Me etc. I'm presuming they just run loads of shelf eq's over the sample, bit crushed the rest then added their own thumping kick and bloody awful side chain compression to mask what they couldn't get rid off. Burning and that was alright but Daft Punk have got a bloody lot to answer for.