Click the green flag to listen to some generative music. ☛ The scale is randomized each time you click the green flag. ☛ The tempo can be changed at any time. ☛ To change the rhythm and number of instruments, adjust the sliders and then click the green flag.
This is probably the most natural-sounding generative music project I've done so far, but it is actually not very complex. For example, it only generates a single pattern that repeated over and over with a key change every two bars. If you like this, you might enjoy Simple Generative Music: https://scratch.mit.edu/projects/520817595 I borrowed the scales from BeepBox: https://www.beepbox.co/