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

Doubly augmented fifth

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

The doubly augmented fifth requires that:

  • The interval must be a fifth interval (five note names between the first and the last).
  • The interval must have nine half steps.

What does a doubly augmented fifth look like?

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

doubly augmented fifth

How to recognize a doubly augmented fifth?

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♭ / G#:

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

C major scale

From the rule stated above, the interval C♮ / G♮ is a perfect fifth, so the interval C♮ / G# is an augmented fifth, so the interval C♭ / G# is a doubly augmented fifth.

Inversion of the doubly augmented fifth

The inversion of the doubly augmented fifth is the doubly diminished fourth.

Here is an example of a doubly diminished fourth:

doubly diminished fourth

Musical examples of doubly augmented fifth

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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