So I have been trying to figure out the origin of the faint music I keep hearing. It sounded like something playing through headphones somewhere, that I was only hearing a few notes of now and then over the computer fan and whatnot.

Eventually figured out it's my keyboard. Any lateral motion, including brushing the side of a key with the mouse cable or just breathing while resting my hands on the keys, will trigger a very faint pinging tone. The space bar is tuned to E5, the letter keys to C5.

If it wasn't a perfect (to my hearing anyhow) musical third it probably wouldn't have registered as music quite so much.

But now I can't unhear it and it also sings, particularly the space bar, while I type.

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