You can go to The Cosby Show to find a rap based on Julius Caesar, but if you really want something special, you have to head to a 1998 Star Trek-related film entitled Free Enterprise.
There, William Shatner himself sings (chants? recites? vociferates?) a song with a high percentage of lyrics from the play itself.
It’s pretty hard to describe. So you’ll just have to try it out for yourself!