A lot of tutorials/books that say they are about "music theory" are really just about "music notation". Actual music theory (why is the major scale arranged the way it is? Why do chords often have neat frequency ratios? Why are there 12 semitones in an octave?) you have to dig a bit deeper, these are quite good:
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A lot of tutorials/books that say they are about "music theory" are really just about "music notation". Actual music theory (why is the major scale arranged the way it is? Why do chords often have neat frequency ratios? Why are there 12 semitones in an octave?) you have to dig a bit deeper, these are quite good:
https://eev.ee/blog/2016/09/15/music-theory-for-nerds/
https://www.lightnote.co/