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Guitar Lessons

Musical intervals and frequency ratios

In music theory an interval is the distance between two notes pitches.

Table 1 represents musical intervals and their frequency ratios.

Interval Number of semitones Frequency ratio
Perfect unison 0 1,0000
Minor second 1 1,0595
Major second 2 1,1225
Minor third 3 1,1892
Major third 4 1,2599
Fourth 5 1,3348
Diminished fifth 6 1,4142
Perfect fifth 7 1,4983
Augmented fifth 8 1,5874
Sixth 9 1,6818
Minor seventh 10 1,7818
Major seventh 11 1,8897
Octave 12 2,0000

Table 1 Musical intervals and their frequency ratios

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