The reason? Those add popping sounds to the vocals. Instead, singer Laila Skovmand traps an air bubble in her mouth and sings through it. It's kind of wild. The rest of the instruments are pretty crazy too, given how traditional music-making devices are designed to work (mostly) dry. In addition to a carbon fiber violin, the band is using custom-made instruments like a rotacorda (inspired by the hurdy-gurdy), a water organ (hydraulophone) and a crystallaphone (an aquatic take on Benjamin Franklin's glass harmonica) that work with dihydrogen monoxide, rather than against it.

Beyond that, instrument maker Andy Cavorta wasn't prepared for possibly electrocuting the musicians based on the materials he used to craft their noisemakers -- metals from opposite ends of the electropotential series essentially create a wet-cell battery when submerged. That rules out a tank containing zinc and brass instruments, New Scientist writes.

If you can't make it to Rotterdam in time for AquaSonic's first show on May 27th there's an eerie teaser video embedded above. Maybe instead of just performing in aquariums, the band will eventually record their album on the highest-resolution format ever -- water -- and write a song specifically for sea creatures. Wait, Dethklok already did both of those.