50 Cent

Yes, early-aughts hip-hop star 50 Cent is playing the Ravinia Festival, which means that he may have to change the opening verse of his 2003 single "In Da Club" to something along the lines of "You can find me on the lawn, plastic cup full of Shiraz." The former Vitamin Water spokesman otherwise known as Curtis James Jackson III hasn't released an album from 2014, so you can expect plenty of back catalog gems like "Candy Shop" and "Ayo Technology."