the.com/tuner
the quiet genius who teaches steel and wood to agree on a frequency
a440 standardMost tune to A vibrating 440 times per second
beat tonesTwo off notes create a wobble ears can count
piano marathonA grand piano hides over 200 strings to tame
engine cousinCar tuners chase horsepower the same obsessive way
perfect mythEqual temperament makes every key slightly, deliberately wrong