Heptatonic

A heptatonic scale, occasionally called a septatonic scale is a scale with 7 tones per equave.

Heptatonic MOS scales may be found at: Heptatonic MOS.

Other heptatonic scales may be found at: Category:7-tone scales.

“Equiheptatonic” scales are scales with 7 roughly equally spaced tones per octave. These occur in many tunings around the world, including some African scales^[who?]. They are usually not exactly equally spaced, but deviate from equal by small amounts.

An exactly equal equiheptatonic scale is 7edo, which is popular with modern Western xenharmonic composers.