In terms of music theory, an interval is defined as the difference between two pitches. There are many different types of intervals, such as horizontal, vertical, melodic, linear or harmonic. Let's focus on what a harmonic interval is.

Harmonic Interval

Simultaneous notes of a different pitch create harmony. The interval between these notes is called harmonic intervals. On the other hand, melodic intervals when notes of different pitches are played in one after another are not together. Just like melodic intervals, there are harmonic 2, 3, 4, 5, 6, etc.  Harmony is a kind of guidance. Play piano for example, the left hand usually plays the harmonic intervals in the lower register, while the right hand usually plays the melody on the higher register. 

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