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HOW DO CHORD PROGRESSIONS WORK? FOATING IN SPACE
Suppose you have tens of millions of dollars or euros burning a hole in your jeans. That’s what it costs to visit one of the space stations (they're ready to book your flight; operators are standing by.)
Once you’re up there, the space station orbits in a certain direction. But inside the spacecraft, your body floats all over the place. You do not perceive your motion to be “up” or “down.” There’s no “up” or “down” in space. So you get space sickness and you barf. And your fellow astronauts move away from you and mutter to each other about how disgusting you are.
That’s how chord progressions work. Chords move, and, under certain circumstances, they move in a perceived direction. But they do not move “up” or “down,” the way melody does. There’s no “up” or “down” in harmony. So, if you don’t know what you’re doing when you create a chord progression, your listeners may get chord sickness and barf.