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Pythagorean harmonics. BC Ancient Greek philosopher Pythagoras. At upper left (labelled Tubal-Cain, biblical blacksmith) he is listening to the sounds made by blacksmiths at work. At upper right he experiments with different ratios of bells and water-filled glasses. At lower left, stretched strings with different ratios are being plucked. At lower right, Pythagoras and his student Philolaus play pipes in various ratios. Woodcut from 'Theorica Musice' (1492) by Italian music theorist Franchinus Gaffurius (1451-1522).
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