four just minor thirds, such as G–B–D–F–A, produces an interval of 648/625 between A and G. Etc. An interesting property of temperaments is that this difference remains whatever the tuning of the intervals forming the circle. In this sense, commas and other minute intervals can never be completely tempered out, whatever the tuning. Comma sequence A comma sequence defines a musical temperament through a unique sequence of commas at increasing prime limits. The first comma of the comma sequence is in the q-limit, where is the nth odd prime, and is the number of generators. Subsequent commas are in prime limits, each one prime beyond the last. Other intervals called commas There are also several intervals called commas, which are not technically commas because they are not rational fractions like those above, but are irrational approximations of them. These include the Holdrian and Mercator's commas. See also List of musical intervals List of pitch intervals Semicomma References Musical temperaments