I found this elsewhere, and haven't tried it, but this sounded more like what you are looking for:

"There's also this: https://www.microsoft.com/en-us/research/project/songsmith-2/

which uses a BIAB engine to generate accompaniment to a melody line (Songsmith analyzes an audio melody...for example, you can hum a melody into it...and it generates a chord progression based on that melody, using a handful of BIAB styles to play back the accompaniment). The project never went very far and it doesn't actually do a very good job of generating musical chord progressions.."

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