I guess it could be neat to play 100 of these at the same tempo at once but otherwise I'm having trouble coming up a use case for this...
You know how they used heavy metal music to break the spirit of Manuel Noriega? I'm sure there's some DoD (or is it DoW now?) psychological operations people right now studying the prolonged effects of high volume mediocre AI slop music.
https://www.bbc.com/news/world-latin-america-40090809
Or I suppose they could just put "baby shark" on a loop.
The use case is control. It's essentially a controlnet for the actual music writing. So a musician could compose melody, harmony, and lyrics and generate many performances of the same song until they get one they like. A non-musician could similarly generate the symbolic input from scratch, and perhaps they like the composition but not the performance. This allows them to re-render and re-render until they like the performance.
Numbers Stations