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''<u>Harmony'' </u> is the pattern of how frequencies interact. Most natural sounds are relatively noisy - they contain a random selection of frequencies. The true definition of noise is sound with equal distribution of all audible frequencies. Consider an untuned radio or TV, which produces white noise - you cannot "zero-in" on any particular frequency, although your brain may try. Noise is chaos, and all true noise is undifferentiatable from other true noise, regardless of its source.
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Conversely, a sine wave represents a single specific frequency. Again, this is more easily understood by our minds - we can recognize it easily and even recreate it vocally. Most instruments are designed to sound such distinct frequencies, called <u>pitches</u>, which correspond to certain [[#Notes and Movement|<u>notes</u>]]. Harmony is concerned mostly with the interaction of multiple notes - 2 or more notes combine to form a unique waveform, which we can perceive.