I find this much more useful because it talks about _why_ intervals like the octave and fifth sound 'right' and then explains how that influenced the evolution

I find this much more useful because it talks about _why_ intervals like the octave and fifth sound 'right' and then explains how that influenced the evolution of the western scales (colloquially: why is the pattern of white/black keys on a piano that particular pattern?) https://eev.ee/blog/2016/09/15/music-theory-for-nerds/ https://eev.ee/blog/2016/09/15/music-theory-for-nerds/ (posted to hn 7 years ago https://news.ycombinator.com/item?id=12528144 https://news.ycombinator.com/item?id=12528144 )