While I don't remember the dates, our guide said a man wired an old organ in the cavern and played the song heard here: a Christian hymn called "A Mighty Fortress Is Our God". At 0:23, I focused on a on of many rubber mallets programmed to strike different rock structures and create the notes. Sorry about the poor quality and noisy tourists (they were from Europe and didn't understand "don't touch the rocks".) It's very eerie and sad, but a brilliant idea.
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