Augmented second

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

The augmented second requires that:

- The interval must be an second interval (two note names between the first and the last).
- The interval must have three half steps.

What does a augmented second look like?

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


How to recognize a augmented second?

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 / D♯:

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

C major scale

From the rule stated above, the interval C / D is a major second, so the interval C / D♯ is a augmented second.

Inversion of the augmented second

The inversion of the augmented second is the diminished seventh.

Here is an example of a diminished seventh:


Musical examples of augmented second

For music lovers accustomed to western tonal music, the augmented second immediately sounds oriental:

Hava Nagila

Hava Nagila is a Hebrew folk song that features a few augmented seconds:


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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