I wonder if there's any potential merit to writing music in a tempo that's a sub-harmonic of the key it's in, e.g. with A=440 you could write a piece in Am at 103.25bpm which is 1.71875Hz or 8 octaves below that 440.
I guess there'd only be any real use if you're having stuff playing at speeds on the boundaries between "lots of fast notes" and "one really low note" cause then it'd all line up super nicely.
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