So this is the beginning of jazz songwriting. It's raw, I get it. And I'd recommend headphones.
It's a 12-bar in F rather than the 8-bar in B-Flat I was originally thinking.
I've tried to come up with a definitive head for the melody. In this experiment, I went head, solo, head solo...
I'll work on it over the next few days and see if I can refine it.
It's really quite tough to keep time like this without a drummer.