Music theory > Lessons > Pitch of sounds > Intervals > Doubly diminished fourth

Doubly diminished fourth

In music theory, a doubly diminished fourth is an interval that has three half steps united states of america (semitones united kingdom).

The doubly diminished fourth requires that:

  • The interval must be a fourth interval (four note names between the first and the last).
  • The interval must have three half steps.

What does a doubly diminished fourth look like?

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

doubly diminished fourth

How to recognize a doubly diminished fourth?

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 / F♭♭:

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

C major scale

From the rule stated above, the interval C / F is a perfect fourth, so the interval C / F♭ is a diminished fourth, and so the interval C / F♭♭ is a doubly diminished fourth.

Inversion of the doubly diminished fourth

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

Here is an example of a doubly augmented fifth:

doubly augmented fifth

Musical examples of doubly diminished fourth

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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