EDO

An equal division of the octave (EDO or edo, /ido/) is a tuning system constructed by dividing the octave into a number of equal steps.

The dominant modern tuning system may be called 12edo (12-EDO) because it divides the octave into 12 semitones that are all the same size. It may also be called 12-tone equal temperament or 12-TET, but this is discouraged because it does not specify which interval is being equally divided.

List of Edos

Very incomplete edo table. Popular edos are highlighted.

Edo	Description	First twelve steps, from 0¢
5	The smallest edo to have strong melodic properties. Good approximation of 2.3.7 for its size.	240, 480, 720, 960, 1200
6	Subset of 12edo. Good approximation of 2.9.5.7 for its size, such as in Didacus temperament.	200, 400, 600, 800, 1000, 1200
...	...	...
31	The definitive Septimal Meantone tuning. One of the most popular edos.	38.7, 77.4, 116.1, 154.8, 193.5, 232.3, 271.0, 309.7, 348.4, 387.1, 425.8, 464.5