You may not have heard of Prote-J, a 21-year-old hip-hop artist from Orlando, by way of Los Angeles and Papua New Guinea, but if you've been to a Brewers game in the past year or so you've heard his song "Heir to the Throne," which is Prince Fielder's at-bat song. We caught up with the composer and asked about his music and his relationship with the Brewers first baseman.