An Interval in music refers to the distance between any two notes. The types of Intervals are, Unison, Perfect, Major, Minor, Augmented and Diminished. Intervals are used in both Chords and Melody. In Chords, Intervals are the distance between each Chord tone. In Melody, Intervals are the distance (scale steps) from one note in the Melody to the next.
When an Interval is Major or Perfect and is raised by one Half Step, it is called Augmented. Any Major Interval that is lowered one Half Step is Minor. A Perfect Interval lowered by one Half Step is Diminished.
This chart shows Intervals up to the 15th scale degree. The name of each Interval appears in the list that follows this chart, and corresponds with the number displayed under each Interval.