Making #ChipTune music using #PixiTracker which is gratis for the desktop and or a cheap app. Get the 16bit variant, not the 1bit variant.
My 35s track: https://alexschroeder.ch/music/Giana%20My%20Invisible%20Friend/01%20Pixie%20Dance.mp3

Rambling blog post to go along with it: https://alexschroeder.ch/wiki/2018-06-06_PixiTracker_My_Love