Probably these would be harmonic units. Unfortunately notes aren't just characters in this. There's also voice leading, and so harmony "words" run into each oth

Probably these would be harmonic units. Unfortunately notes aren't just characters in this. There's also voice leading, and so harmony "words" run into each other and can't be mutually exclusively tokenized. The better analogy might be poetry, and I'm not sure if there are good poetry generators, either.