Pythagoras - Greek mathematician, philosopher; generally considered to be the “father of the science of acoustics” (on his establishment of a fundamental connection between numbers, geometry and sound, even of the celestial bodies and the elements, through his experiments on the properties of vibrating strings that produce pleasing musical intervals, which led to a system named after him, “Pythagorean tuning”, stating that the frequency ratios of all intervals are determined by choosing a sequence of fifths which are "pure" or perfect, with a distinct ratio of 3:2, meaning the upper note makes three vibrations in the same amount of time that the lower note makes two - split a string in half, and it will be raised one octave in pitch; the system generates a scale by stacking perfect fifths, a process that is then repeated with octaves (a 2:1 ratio) to keep the pitches within a desired range)

Pythagoras (born c. 570 BCE - died c. 500–490 BCE)