Do you know what a song is? It's like when someone uses their voice to make a pretty sound that you listen to. Messiah is a really special song that was made a long time ago by a man named Handel. He made it to tell a story about a really important person called the Messiah.
Now, the Messiah is someone that lots of people believe in and think is really special. In the song, Handel talks about how the Messiah was going to come and save people from their sins.
But that's not all! The Messiah is also supposed to be a king and a leader for everyone. So, Handel made the song really big and grand, with lots of different parts that all come together to make something really amazing to listen to.
People still listen to Messiah today, because it's such a beautiful and powerful song. Some people even sing it in big groups all together, which is called a choir. It's like everyone is singing together to celebrate and worship the Messiah. Isn't that cool?