I watched a video where he demonstrated that many songs use the same tune / Chord progression (?). What is chord progression and why was the one in question essentially uncopyrightable?
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A chord is a stack of individual notes happening at the same time and western music for the last several hundred years has been obsessed with naming the stacks that people really seem to enjoy and describing the patterns between the notes of a stack and how they all move to create the next stack in time. A single stack is a chord and several stacks over time is a chord progression.
Chord progressions in some way can be thought of as floor plans where you can build 100 houses on the same basic layout but get 100 unique houses by changing up a few rooms and decorating differently.
In that way an extremely common chord progression like the “Four Chords of Pop” or the “Doo-wop Changes” can almost be considered as a basic design structure like “Colonial”. But have the same progression doesn’t really make 2 songs identical any more so than my neighbor’s house and mine both having basements makes our houses the same.
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