Re-Using Music

I recently watched Gladiator with Russell Crowe and Joaquin Phoenix, and it was a pretty good movie. At a few points in the movie, I noticed a theme in the music that sounded extremely familiar:

It took a couple times of hearing the theme, but I did eventually realize where I had heard it:

So dramatic. That's Russell Watson singing the theme on his album Amore Musica, appropriately titled "Il gladiatore." It really fits in the movie. According to Wikipedia, Pavarotti sang it on one of his CDs first, and almost sung it in the movie.

An interesting find.