Sixth
Sixth : A unit used in music to describe the ratio in frequency between notes. Two notes differ by one minor sixth if the higher note has frequency exactly 8/5 times the frequency of the lower one, or by a major sixth if the higher note has frequency exactly 5/3 times the frequency of the lower one. On the standard 12-tone scale the minor sixth is approximated (roughly) by 8 half steps, corresponding to a frequency ratio of 22/3 = 1.5874; the major sixth is approximated by 9 half steps, corresponding to a frequency ratio of 23/4 = 1.6818
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