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Harmonic pitches produced by the division of strings were known in China. They may have been used to tune sets of bells or stone chimes, but the classical writings on music discuss a 12-tone system in relation to the blowing of bamboo pipes (lü). The first pipe produces a basic pitch called yellow bell (huangzhong). This concept is of special interest because it is the world’s oldest information on a tonal system concerned with very specific pitches as well as the intervals between them. The precise number of vibrations per second that created the yellow bell pitch is open to ...(100 of 8576 words)