ELI5: Explain Like I'm 5

O Fortuna

O Fortuna is like a big, big song that lots of people like to hear. It has words that are sung in a language that's not English, but it sounds really cool. It's kind of like a story about how sometimes things are good, and sometimes things are bad, and you can't really control that. It's like when you're playing a game and sometimes you win, and sometimes you lose, but you keep playing anyway. The music is really loud and strong, with lots of different instruments playing together. It makes you feel like you're part of something really big and important. People have been listening to O Fortuna for a long, long time because it's so powerful and exciting.