In music

Music

Music is an art form whose medium is sound and silence. Its common elements are pitch , rhythm , dynamics, and the sonic qualities of timbre and texture...

, a major fourth is the interval

Interval (music)

In music theory, an interval is a combination of two notes, or the ratio between their frequencies. Two-note combinations are also called dyads...

 from the quarter tone

Quarter tone

A quarter tone , is a pitch halfway between the usual notes of a chromatic scale, an interval about half as wide as a semitone, which is half a whole tone....

 scale, named by Ivan Wyschnegradsky, between the perfect fourth

Perfect fourth

In classical music from Western culture, a fourth is a musical interval encompassing four staff positions , and the perfect fourth is a fourth spanning five semitones. For example, the ascending interval from C to the next F is a perfect fourth, as the note F lies five semitones above C, and there...

 (500 cents) and the augmented fourth (600 cents) and thus 550 cents

Cent (music)

The cent is a logarithmic unit of measure used for musical intervals. Twelve-tone equal temperament divides the octave into 12 semitones of 100 cents each...

. It inverts to a minor fifth

Minor fifth

In music, a minor fifth is the interval from the quarter tone scale, named by Ivan Wyschnegradsky, between the diminished fifth and the perfect fifth and thus 650 cents...

.

The term may also be applied to the ratio 45:32 or 590.22 cents , formed from the major third (5/4 = 386.31) and the major tone (9/8 = 203.91), which is flat of the ET tritone

Tritone

In classical music from Western culture, the tritone |tone]]) is traditionally defined as a musical interval composed of three whole tones. In a chromatic scale, each whole tone can be further divided into two semitones...

, which is 600 cents.