List of intervals in 5-limit just intonation
The intervals of 5-limit
just intonationare ratios involving only the powers of 2, 3, and 5. The fundamental intervals are the superparticular ratios 2/1 (the octave), 3/2 (the perfect fifth) and 5/4 (the major third). That is, the notes of the major triad are in the ratio 2:5/4:3/2 or 4:5:6.
In all tunings, the
major thirdis equivalent to two major seconds. However, because just intonation does not allow the irrational ratio of √5/2, two different frequency ratios are used: the major tone(9/8) and the minor tone(10/9).
The intervals within the
diatonic scaleare shown in the table below.
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