I have to admit I don't understand what exactly the problem is we're trying to solve with ML here...?
Decomposing sounds from (fully produced?) tracks into underlying components, and then giving the user the option to synthesize them with different parameter settings. I think.
I wouldn't exactly say it's trying to solve a problem. It's to explore and see what happens which is what music is all about. It's also a unique niche model I haven't seen before.