Not the only instrument to use Pythagorean tuning I object to this statement Since Pythagoras calculated the formula for the musical cycle of fourths and fifths Steel Pans are the only instruments made to follow this configuration Surely there have been many other instruments designed with pythagorean tuning over the centuries Furthermore it s not even clear to me that every Steel Pan s tuning is based on exact 3 2 frequency ratios in practice I suspect they may often be tuned to 12 TET