A minor third above C is Eb.

Again, I’ve drawn two ways to play the same interval. Listen and you’ll see they are the same note.

### Major Third Interval

Next is the interval of a major third. A major third is equal to 4 half-steps.
The major 3rd is abbreviated **M3**.

A major third above C is E.

**Most chords are built from combinations of major and minor thirds.**

### Perfect Fourth Interval

A perfect fourth is equal to 5 half-steps. Perfect intervals have a very consonant sound and are not said to be major or minor.
A perfect 4th interval is abbreviated **P4**.

A perfect fourth above C is F.

The bass is tuned in perfect 4ths – from E to A is a 4th, from A to D is a 4th, and so on.

### Augmented Fourth Interval/Diminished Fifth Interval

To augment means to make bigger. (Think of your own examples of augmentation.) An augmented fourth interval is a *bigger fourth*. It is equal to 6 half-steps.
This interval can also be called a *diminished fifth*. To diminish means to take away or make smaller. A diminished fifth interval is a *smaller fifth*. (The fifth is coming up next.)

There is yet a third way to name this interval. It is often called a tritone. A tritone is the same as 3 wholetones (6 half-steps).

An augmented 4th/diminished 5th is abbreviated A4 or D5. More often musicians will call it a #4 ("sharp four") or b5 ("flat five") when speaking of chords or scales.

An augmented fourth above C is F#. A diminished fifth above C is Gb.

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