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Just Interval


Definition

An interval between two pitches is called "just" if the ratio of frequencies of the two pitches is equal to the ratio of two whole numbers (especially, small whole numbers). Here are the ratios for some intervals:

  • 1:1 Unison
  • 2:1 Octave
  • 3:2 Perfect fifth
  • 4:3 Perfect fourth
  • 5:4 Major third
  • 6:5 Minor third

    Just intervals are free from "beats", and are generally considered to sound more "in-tune" than non-just intervals.