Polish music group GlassDuo is famous for playing eerie, high-pitched tunes on a giant glass harp made from wine glasses. In the above video, which was spotted by Atlas Obscura, members Anna and Arkadiusz Szafraniec play the iconic "Hedwig's Theme" from the Harry Potter movies at the 2013 Festival of Nations in Dollywood, Tennessee.

Watch them transform ordinary glassware into musical magic, and visit the duo's YouTube channel to view even more performances.

[h/t Atlas Obscura]

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