Over the weekend, Kanye West surprised fans at a Kid Cudi gig in Chicago.
On Saturday night, he joined him on stage to perform Father Stretch My Hands Pt 1, from his 2016 album, The Life of Pablo.
Some fans caught it on video.
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This was Kanye's first performance in almost a year, since Kanye cancelled the remainder of his Saint Pablo Tour, and was hospitalised for his 'own health and safety'.
Kanye cancelled the tour after his gig in Sacramento. He had cut the gig short after a half an hour, after he went on a rant about Beyonce and JAY-Z.