Did you know stalactites are hollow and vibrate sound if you knock your hand against them? They each make different sounds.
I can't quite place what musical instrument they sound like. It's reminiscent of an organ, if you only hit one note. It might sound a little like a tuba, or French horn or maybe just vaguely of brass instruments, in general.
Antidotal evidence (as in I didn't check any documentation and am going on one guy's statement) suggests the Mayans would play the stalactites during rituals they performed in caves.
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Random Facts
RandomRandom Facts about random stuff. I'll follow rarely themes . Have fun with the random facts! Will include swearing at some points.