Harmony and Disharmony (Counterpoint) : one can experience an aligning and comforting type of sound using harmony.
When disharmonious musical sounds are used one can feel an awkward, unusual or unpredictable feeling.
Harmony and Disharmony are essentially the arranging of different sounds together in a chosen or desired way by the songwriter, to create an intended effect within the listener.
The overall process of composing melodies in some sort of coordination with other melodies, whether Harmonious or Disharmonious, is called Counterpoint.
Wolfgang Amadeus Mozart is still considered a master at Counterpoint, which he clearly demonstrated by the vast array of truly inspiring music he composed during his short but extremely productive life, • like in this famous piece.