Imagine you are in an orchestra. When the orchestra began to play, a horrendous sound went out. All the instruments were out of tune. You tried to fix it by tuning your own instrument to itself. The orchestra remained dissonant. You tuned to the person next to you. Though the two of you sounded good together, still the orchestra sounded like a million cat shrieks. In order for an orchestra to sound harmonious, you need a source tone, a note to which each instrument is tuned.
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