YU
Text: An interval of the Chinese scale. The ancient Chinese divided the octave into twelve equal parts, like the semitones of our chromatic scale, which were called lu. Thier scale, as commonly used, consisted, however, of only five notes, which were called koung, chang, kio, tché, and yu, and which corresponded to our F, G, A, C, D; koung of F being considered to be the normal key.
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Source: 125