Augmented third

In music theory, an augmented third is an interval that has five half steps united states of america (semitones united kingdom).

The augmented third requires that:

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

What does an augmented third look like?

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


How to recognize an augmented third?

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 G♭ / B♮:

Let's take the G flat major scale to have G♭ as the tonic:

G flat major scale

From the rule stated above, the interval G♭ / B♭ is a major third, so the intervall G♭ / B♮ is an augmented third.

Inversion of the augmented third

The inversion of the augmented third is the diminished sixth.

Here is an example of a diminished sixth:


Musical examples of augmented third

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
music theory games

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