When I was finishing high school I was introduced to an interest in programming through finding the limits of a composition applet on my Nokia (which was probably a 6300 but I'm away from home and unable to check).

I know this is an unrelated tangent but does anybody have any links that talk about the one or more of the composition apps or applets for smartphones or feature phones from that time period? Symbian, early versions of iOS, J2ME, I'll happily take anything on offer.

Random Riff generates random guitar riffs in the Minor Pentatonic scale. Seems similar to some of the ones in this list. It’s more so you can tweak them on your guitar than listen to them, although you can click on notes to hear them.

https://riff.joeldare.com

On that realm of apps, sequencer

https://apps.apple.com/us/app/assemble-light/id1525742798

First one I tried it says not available for my device as it was produced for an older version of Android.