Minor sixth

For example, the interval from A to F is a minor sixth, as the note F lies eight semitones above A, and there are six staff positions from A to F. Diminished and augmented sixths span the same number of staff positions, but consist of a different number of semitones (seven and ten respectively).

In 12-tone equal temperament (12-ET), the minor sixth is enharmonically equivalent to the augmented fifth.

In just intonation multiple definitions of a minor sixth can exist: The minor sixth is one of consonances of common practice music, along with the unison, octave, perfect fifth, major and minor thirds, major sixth and (sometimes) the perfect fourth.

In the common practice period, sixths were considered interesting and dynamic consonances along with their inverses the thirds, but in medieval times they were considered dissonances unusable in a stable final sonority.

In that period they were tuned to the flatter Pythagorean minor sixth of 128:81.