I mostly did not read it, but skimmed the words, and played with the code. That's much more instructive. It's not "music theory" proper, it's rather about the

I mostly did not read it, but skimmed the words, and played with the code. That's much more instructive. It's not "music theory" proper, it's rather about the underpinnings of the "music language", the basics you need to know to even be able to speak about music theory, and in this regard it's quite useful.