OK, so, tangentially related: I tried to do something once - I took small chunks of songs generated by SampleRNN in an attempt to stitch together the ones that sounded the most similar to create a much longer track.

The script [1] uses Essentia Chromaprint [2] to "grade" the similarity of audio tracks, and combine the ones with the closest chromaprint. No crossfade or BPM matching, just yolo concatenation.

I have a track on Soundcloud which uses the above technique (mashing together short generated clips by their chromagram), trained on Cannibal Corpse [3]

1: https://github.com/sevagh/1000sharks.xyz/blob/master/sampler...

2: https://essentia.upf.edu/reference/std_Chromaprinter.html

3: https://soundcloud.com/user-167126026/1000sharks-domainal-sk...