The lowest note on the common four string bass is E at 41.3 Hz. Five string bass goes lower, probably around 30 Hz (the note is B, but I don't remember the frequency.) Many electric keyboards can get bass at or below 30 Hz. I suspect that few recordings use it, though, as most electronic music is intended for portable boom-box use anyway, where 30 Hz would sound very strange on those 6 inch speakers. There are some orchestra instuments that can go down to 30 Hz. I believe contra-bassoon goes to 28 Hz. Pianos go down into the 20's as well. Some big drums are tuned that low, also.
Action movies is where the subwoofer makes a big difference. Nothing like a 25 Hz rumble coming from an earthquake or dinosaur walking, or maybe a rocket taking off or bombs exploding.
Very musical!
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