Septimal major third

[7] It is equal to 435 cents,[4] sharper than a just major third (5:4) by the septimal quarter tone (36:35) (playⓘ).

In 24-TET the septimal major third is approximated by 9 quarter tones, or 450 cents (playⓘ).

This interval has a characteristic brassy sound which is much less sweet than a pure major third, but is classed as a 9-limit consonance.

In the early meantone era the interval made its appearance as the alternative major third in remote keys, under the name diminished fourth.

Tunings of the meantone fifth in the neighborhood of Zarlino's 2⁄7-comma meantone will give four septimal thirds among the twelve major thirds of the tuning; this entails that three septimal major triads appear along with one chord containing a septimal major third with an ordinary minor third above it, making up a wolf fifth.