Please answer a question about the following article about Detroit:

In the 1990s and the new millennium, the city has produced a number of influential hip hop artists, including Eminem, the hip-hop artist with the highest cumulative sales, hip-hop producer J Dilla, rapper and producer Esham and hip hop duo Insane Clown Posse. The city is also home to rappers Big Sean and Danny Brown. The band Sponge toured and produced music, with artists such as Kid Rock and Uncle Kracker. The city also has an active garage rock genre that has generated national attention with acts such as: The White Stripes, The Von Bondies, The Detroit Cobras, The Dirtbombs, Electric Six, and The Hard Lessons.

What is J Dilla's occupation?
producer