Cudi's in the midst of the Passion, Pain & Demon Slayin' World Tour.
Kanye has not been on stage past November since canceling his Saint Pablo Tour.
Kanye and Cudi played "Father Stretch my hands, Pt. 1" at Chicago's Aragon Ballroom.
You'll recall he'd a mental breakdown and finished up at the UCLA psychiatric ward, but he's bounced back in a big way.