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. They are usually not exactly equally spaced, but deviate from equal by small amounts, often to improve the tuning of 3/1 and 5/1.

Musical traditions that make use of equiheptatonic scales include:

• Eastern Angolan music
• Cambodian classical music
• Ancient Greek auloi music
• Laotian classical music
• Thai classical music
• Vietnamese classical music
• Lower Zambezi music
  • Nyungwe music

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