Okay yes, technically it would very difficult to track and no one would probably even know the musician is using such a model. But as an academic, I’d prefer to do legal things only :P especially if I want to use results in a publication down the line.

And yes, I’d make money off it. would charge $x/full piano cover request.

songs are mostly from US and Canada, but some are international (ie from Asia).

great points. the focus is so he can create more covers with the model. so the latter.

would the fair use norm be that its transforming the original songs/being trained on transformations so it would be all good? the original songs would be used during training as input to the model, but any generations would still have royalties be returned to the songwriters should the musician intend to monetize them.

re your last point: this musician has a lot of data. 30+ hours :P