Although, I'm not the OP, let me answer your question. What's the Musashi?
She was one of five planned Yamato-class battleships, and served under the Imperial Japanese Navy during WW2. Named after one of the former Japanese provinces, along with the Yamato, they were both the largest battleships built. (70,000 tons, I believe.)
She was sunk in the Battle of the Leyte Gulf, by American aircraft.