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.
Surely while thinking of ideas to draw your work, you spent a lot of time on it, right? I recommend you to play Tiny Fishing to regain energy and get more interesting and wonderful ideas.