Sister Sealand may be cute, quiet, petite, and generally very formal. But she won't hesitate to get violent and swear like a sailor if she feels like it.
Written by Icelandic composer Jón Leifs in 1964, the piece called Hekla, Op 52, requires four sets of rocks hit with hammers, steel plates, anvils, sirens, cannons and metal chains to play.
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