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Major fourth

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Title: Major fourth  
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Major fourth

Major fourth
Inverse Minor fifth
Other names Just augmented fourth
Abbreviation m4
Semitones ~5½
Interval class ~5½
Just interval 45:32
Just intonation 590.22

In music, a major fourth (About this sound   ) is the interval from the quarter tone scale, named by Ivan Wyschnegradsky, between the perfect fourth (500 cents) and the augmented fourth (600 cents) and thus 550 cents (Fhalf sharp). It inverts to a minor fifth.

Just augmented fourth on C.

The term may also be applied to the ratio 45:32 (F+) or 590.22 cents (About this sound   ), formed from the major third (5/4 = 386.31) and the major tone (9/8 = 203.91),[1] which is flat of the ET tritone, which is 600 cents.

See also


  1. ^ Richard Mackenzie Bacon (1821). "Manuscript Work of Francesco Bianchl", The Quarterly Musical Magazine and Review, Volume 3, p.56.
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