Music theory > Lessons > Pitch of sounds > Intervals > Doubly augmented sixth

Doubly augmented sixth

In music theory, a doubly augmented sixth is an interval that has eleven half steps united states of america (semitones united kingdom).

The doubly augmented sixth requires that:

  • The interval must be a sixth interval (six note names between the first and the last).
  • The interval must have eleven half steps.

What does a doubly augmented sixth look like?

Here is an example of a melodic doubly augmented sixth (two music notes in a melody) and a harmonic doubly augmented sixth (in a chord):

Doubly augmented sixth

How to recognize a doubly augmented sixth?

Rule of music theory: All intervals in a major scale starting with the tonic (degree I) are either major or perfect, and only unison, octave, fourth and fifth are perfect (the others are major).

Example with the interval C / A♯♯:

Let's take the C major scale to have C as the tonic:

C major scale

From the rule stated above, the interval C / A is a major sixth, so the interval C / A♯ is an augmented sixth, and so the interval C / A♯♯ is a doubly augmented sixth.

Inversion of the doubly augmented sixth

The inversion of the doubly augmented sixth is the doubly diminished third.

Here is an example of a doubly diminished third:

Doubly diminished third

Musical examples of doubly augmented sixth

No examples yet, but feel free to send me some examples!

Interval identification game

You will find this interval in my Intervals identification game:

Find all my music theory games by clicking this link music theory games
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