Minor fifth

In music, a minor fifth ( Play ) is the interval from the quarter tone scale, named by Ivan Wyschnegradsky, between the diminished fifth (600 cents) and the perfect fifth (700 cents) and thus 650 cents. It inverts to a major fourth.

The term may also be applied to the ratio 64:45 or 609.77 cents ( Play ), formed from the perfect fourth (4/3 = 498.04) and the major semitone (16/15 = 111.73), which is sharp of the ET tritone, which is 600 cents.