Chord Progression Visualizer

A little helper app I made for personal use, but if you're learning music you might find it helpful too!

Pick a scale, key and type of progression, and you'll get a list of keys making up the chords of that progression, in the selected scale, in the selected key. If you're like me and can't remember what keys go into a G Major chord, you've got the solution right here!

The source code is included, if you want to learn how this kind of thing works under the hood (or just get a free basic button system for your Game Maker game)

Disclaimer: I'm still pretty bad at music theory and I'm using basic one-size-fits-all maths to generate the chord data, so I don't guarantee everything the program spits out is correct! Being aware about stuff like tritones and harmonic intervals and correcting your pianorolls if the output looks weird might be necessary.