# If the fraction of the frequencies of two notes have a common factor between the numerator and denominator, the two notes are harmonious.

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If the fraction of the frequencies of two notes have a common factor between the numerator and denominator, the two notes are harmonious. Use the graphic below tofind the fraction of frequency of notes D and B.

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So, the fraction of the frequencies of notes D and B is 3/5.Clearly, the notes D and B are harmonies. Find other pairs of notes which are harmonious.