A metaphor for Sweden's closeted gayness. Also we don't use the term "closet" in England, we tend to call it a wardrobe, or a built in wardrobe, so he clearly doesn't get the joke :p
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.
Sweden is honestly one of my favorite Nordics, the other being Greenland because I can relate to the whole ' I ain't afraid of tha--OHSHNIKEYSI'MOUTBYE' thing.
Laughs, laughs, and the design of the cabinet is by the way not bad. It is worth saying that similar designs can be seen and ordered in Antonovich Design Service https://antonovich-design.ae/ This will help save a lot of time and nerves.