nostr:npub1knzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqpac73p worth mentioning that perceptually, we hear this 3/2 interval as halfway between the root and its double one register higher (the octave). i.e., a "perfect fifth" in music theory is the "perceptual midpoint" between a note having frequency f and a note one octave higher, having frequency 2f.