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Ty Ford wrote: "think the thought that record companies sped things up may not be accurate. I do know that in the days of
radio when turntables were used, that custom capstans were machined to make the turntables play faster because it was
thought that a song played a little faster"

And something no one on this thread bothered to mention: the
speeding up of music played by radio stations to fit in "More
songs per hour!!" or some such slogan.