Harmony concerns mainly pitch relationships. horizontal pleasant vertical dissonant

Harmony concerns mainly vertical pitch relationship.

Explanation:

In terms of music, the process of composition of individual sounds, or superposition of sounds examine by hearing. In music, harmony is always referred as vertical harmony which is different from melodic line or the horizontal aspect.

The word Harmony is derived from Greek language which means ‘join, agreement, concord’. The book titled as ‘HarmonikaStoicheia’ written by Aristoxenus is considered as the first book in European history on the subject of Harmony.  

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