Harmony
Harmony is the pleasing arrangement of combined, simultaneous musical notes structured according to the composition and progression of chords. With harmony, superposition of sounds are orchestrated into congruent parts. Harmony is the playing together of interacting different notes, delivering rich and colorful music.
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Program music, which is believed to create an image in the listener's mind. I hope this helps you.
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Compostition is the nature of something's ingredients or constituents; the way in which a whole or mixture is made up: