Hi! I know this isn’t exactly what you asked but there is a way to add external music to bitsy, so if you found some public domain/creative commons soundtracks you liked you could add them with the “bitsymuse” hack on Borksy? (Google borksy and then tick the Bitsymuse hack, edit the code so you have the names and filepaths of the songs in a zip folder next to the rooms it gives you).

As another non musician making bitsy games, I don’t really have a lot of tone recognition, so I try and go for visual patterns instead?  Music seemes to like staying close for the base, try only going up one and returning to the original. C is usually a good note to loop around. The main notes like going up/down in a staircase pattern, or repeating/mirrored patterns. I have no idea if any of this helps or makes sense but here you go!

Also bitsy has a function to copy and then slow your song, or put it in a minor key, so once you’ve made a song you feel ok about you can make variations very easily to shift the game tone!

A nice feature of the Bitsy tune tool is you can pick a scale (under mood) and limit yourself to that.  I would start off with major (cheery) or minor (gloomy). That way any notes you add will sound in tune with each other. From there, you can build a simple groove, just adding notes on the beats where you want them. The sequencer is already divided up into a 4/4 pattern, so it's just a matter of playing around, adding notes and seeing how it sounds. Stick to one bar (16 steps) at first. Music is a kind of play, and it's key to just play around and try things out and see how they sound to you.

Once you have a basic groove that you like, try removing some notes. Give it some room to breathe. Then copy and paste it into a new bar. Move a few notes around on the new bar so it sounds a little different. Then just keep doing that and iterating. Before you know it, you'll have a whole song.

If you want to check out some example tunes, I made a bunch for my game Sleep Cycle. They all use different techniques. Feel free to download and copy those and mess around with them, remix them, generally do whatever.