[[Image:Enharmonic scale segment on C.png|thumb|Enharmonic scale [segment] on C.]]
<!--
DON'T EDIT THIS UNLESS YOU ARE AWARE THAT "enharmonic scale" is very different from "enharmonic note". Thanks.
-->
In music theory, an enharmonic scale is an ancient Greek musical scale which contains four notes tuned to approximately quarter tone pitches, bracketed (as pairs) between four fixed pitches.
nor were even used in the preceding western tuning systems, such as ¼ comma temperament (the predominant tuning about 200 years ago) or well temperament (finally went out of use as conventional tuning about 140~150 years ago) the pitches and intervals in the several ancient Greek enharmonic scales are foreign to nearly any modern-trained musician, and generally outside the scope of musical competence of modern occidental musicians: People playing modern fixed-pitch instruments have no opportunity to experiment with musical scales containing these notes, since piano keyboards only have provisions for half tones, as do frets on guitars and mandolins, fingering holes on woodwinds, and valves on brass instruments. This has been the situation for more than 150 years for fixed-pitch occidental instruments.
Even among Hellenic musicians, enharmonic scales appear to have gone out of style around ago, and only persisted as a perfunctory part of normal musical training; enharmonic scales seem to have been oddities even to the Greek writers in the Roman Empire, whose works on music theory we still have.
The enharmonic scale uses dieses (divisions) which are not tuned in any pitch present on standard modern keyboards,