A great piece of music inspires many questions, like “What is this piece saying?”, or “Why does it make me feel the way it does?” One question you rarely see, though, is “What are you even playing?” But that’s exactly what La Monte Young forced listeners to ask with his magnum opus, The Well-Tuned Piano, which contains an experimental tuning system that he kept secret for 27 years. So what *was* he playing? Well… It’s complicated.