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Harmony, in philosophy, refers to a pleasing or suitable arrangement of parts, emphasizing balance, proportion, and unity. This concept extends to peaceful coexistence and a state of consistency, where elements fit together coherently.1

In music, harmony is the simultaneous sounding of two or more notes, creating chords. While melody and rhythm can exist independently, harmony is a vertical aspect of music, built upon fundamental intervals like the octave, fifth, and fourth, discovered by Pythagoras. This understanding of numerical proportions and harmony in music influenced the concept of a harmonious cosmos, or "harmony of the spheres".23

While Western music heavily relies on harmony, many other musical cultures, such as those in India and China, primarily use unharmonized melodic lines. Chinese thought, particularly the concept of yinyang, emphasizes complementary opposites that create a dynamic, harmonious universe rather than radical separation.24

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