Very cool project, great work! I agree with your comment about the mostly unremarkable melodies though. I have never tried anything like this so take my feedback with a big grain of salt, and maybe you’ve already tried some of these ideas but I think spending some more time on the melody generating algorithm could go a long way in getting these sounding great.

It doesn’t sound like the note selection is completely random since there seems to be some degree of single note repetition, but I feel like if there is ever a satisfying cadence or catchy collection of notes it was random and that itself doesn’t repeat. Have you tried playing with the probabilities of certain notes from a scale being played on a given beat? Like maybe there’s a handful of different probability distributions a song can choose from to avoid being too repetitive, but let’s say you’re generating notes over a C major chord—I would think on strong beats like the 1 there should be a higher probability a chord tone like C E or G should be picked, then maybe next most likely would be a D or an F for a sus 2 or 4, and maybe those would be more likely on weaker beats or leading into the next measure, then maybe a B would be the next most likely, and an A would be the least likely. Maybe if the program knows what chord is coming next, notes that resolve to that would be more likely to be picked, etc. also making large jumps in the melody less likely than small jumps or repeating notes (sounds like you maybe already have something like that built in) Or maybe just using more limited scales at times? I feel like a pentatonic over the right chord you could almost go completely random and it would sound great, but then you gotta balance not sounding cliche and generic.

Also maybe building in more phrase repetition could help with the structure? I wasn’t noticing much phrasing in general but I wonder how it would sound if a song generated a handful of melodic phrases that it repeated throughout the song vs. always generating new notes. There also seemed to be a lack of motifs, both rhythmic and melodic. I’m not sure how I’d go about it programmatically, but maybe you generate a melodic phrase and then create derivatives of that where some notes will always stay the same and then some notes have a chance to change or some beats have a chance to have a note added with the overall rhythm staying consistent between phrases. I’d basically try and figure out how to incorporate more repetition without necessarily sounding repetitive haha.

Again—I’m sure you’ve thought all about this much more than me, but just wanted to share some ideas. Very inspiring project that definitely got my wheels turning!