Friendly Cows
The Circle of Fifths is central to composing, or even understanding, any music complicated enough to include a key change. Not that anyone understands car gearshifts anymore, but they are a useful metaphor. Just as you can't slam from first gear to fourth gear without it being pretty jarring, you can't jump from one key to another in music randomly without it being jarring. In a car, you have to transition via neutral or other gears in between. That's kind of how music works and the circle of fifths is like a gearshift that let's you do so. With three times the number of gears, and different ones for leaded and unleaded. Metaphors aren't perfect. Most songs, even ones that have nothing but melody, have chords (a group of notes played simultaneously). Those chords are based on the notes of the melody of the song (the melody is the "tune"; the part of a song you would whistle). Sometimes the chords are performed, sometimes not; but even when they are no...
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