Question

What Greek mathematician came up with the idea of the octave and first

focused on the pleasing sounds that some notes make together

Answer 1

Answer:Pythagoras

Explanation:

A tripling of frequency gives a perfect fifth one octave higher. They didn't know this in terms of frequencies, but in terms of lengths of vibrating strings. Pythagoras, who experimented with a monochord, noticed that subdividing a vibrating string into rational proportions produces consonant sounds.