EternAlgoRhythm has an editor where you can create your own collections with algorithms to create both music and levels. It is and will always be available within the demo, so you won't need the full version if you'd like to try your hand at creating your own music.
And now, its tutorials are finally available!
In Part 0: Minimal Setup, we see the steps required to create a collection and have some gameplay in it.
In Part 1: earscript basics, where we learn about the scripting language powering EternAlgoRhythm's procedural generation, and we use it to make our collection a bit fancier!