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## Interval Identification | Diminished And Augmented Intervals (9 of 10)

A diminished interval occurs when a minor or Perfect interval is flattened by one half step.

## Diminished Intervals from Minor

For example, in video seven of this series we learned that, because the two notes are separated by ten consecutive half steps, an interval of a minor seventh above the note A is the note G.

Knowing that a diminished interval is created when a minor interval is flattened by a half step, if an interval of a minor seventh above A is G, then an interval of a diminished seventh above A would be the note G-flat.

Now, the note G-flat is the enharmonic equivalent of the note F-sharp, meaning both letter names are in fact the same pitch.

Therefore, you may have noticed that an interval of a diminished seventh above the note A sounds exactly the same as an interval of a Major sixth.

However, because we are currently discussing an interval of a diminished seventh, we must use the letter name G-flat rather than F-sharp. That is because an interval of a diminished seventh is an alteration of a minor seventh interval which is in fact the note G.

## Diminished Intervals from Perfect

As stated earlier, another way that a diminished interval is created is when a Perfect interval is flattened by one half step.

For example, in video five we learned that an interval of a Perfect fifth above the note C is the note G.