Harmony is a term used to describe two or more notes sounding together. When we looked at chords, you probably noticed that they are built from the bottom up just like the overtone series, forming a “vertical” structure. But harmony can also be implied by using an arpeggio, which is basically a melodic line that outlines a chord structure – also called broken chords. So, the harmonic movement has a “vertical” dimension – chords that provide an accompaniment to a melody; and a “horizontal” dimension – the interaction of multiple melodic lines that create the harmony, a technique called counterpoint.
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