Deezer has published 'Spleeter', which aims to use AI techniques to split a recording back into separate tracks.
https://github.com/deezer/spleeter
There are already some youtube video's by what looks like an independent reviewer, https://www.youtube.com/watch?v=3X5nfc2d1Rw .
While the audio quality isn't that great (yet), it is still SUPER impressive that they've got it working so well already, and it's definitely good enough to pull out some interesting samples.
Spleeter: Deezer source separation library including pretrained models
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