Many (many, many) moons ago, when I was in college, I had the bright idea to design a digital tuner for my bass guitar. Pretty cool stuff for the time (1981/1982), but never quite completed. I don't even remember the details, but I do remember that one of my biggest challenges was to define what the "correct " frequencies were. And it turned out to be a pretty daunting task.
Of course, nowadays, with the internet (and Google!), it's just a matter of a 0.26 secong search, and then picking from the list. THIS would've made my life so much easier back then.
And, with the strange way that my mind works, I now know that the 60Hz hum of our power grid is halfway between a "B" and a "B-flat".... And that's good to know!
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