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`Pythagoras is said to have discovered the numerical relationship between``the length of the strings used in musical instruments and the harmonic``combinations of the sounds. In today’s language, we would describe thatrelationship by saying that the frequency—the number of vibrations per second—of a string vibrating under fixed tension is inversely proportional to the length of the string. Pythagoras probably did not really discover this—he also did not discover the theorem that bears his name—but there is evidence that some relation between string length and pitch was known in his day. If so, one could call that simple mathematical formula the first instance of what we now know as theoretical physics`

**Well Tempering & the musical derivation of the wonderous ‘Phi’ (0.618)**