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I'm quite amazed, actually, that you recognised the music from just that snippet of score!
And somewhat fittingly, the grotto is called The Temple of the Sun!
Don't be amazed Pyxell, I sing in a big choir and over the years I've sung that work at least half a dozen times.
It's a very dramatic work where the heathens are worshipping false gods blah blah blah...and that little snippet you've caught on camera is one of the big moments of outrage.