In music, harmony is the process by which individual sounds are joined together or composed into whole units or compositions.[1] Often, the term harmony refers to simultaneously occurring frequencies, pitches (tones, notes), or chords.[2] However, harmony is generally understood to involve both vertical harmony (chords) and horizontal harmony (melody). [3] Harmony is a perceptual property of music, and, along with melody, one of the building blocks of Western music. Its perception is based on...