The rapper didn't appear on stage at Tennessee's Bonnaroo until 4.25 a.m. Sunday morning – some two hours behind schedule, the Associated Press reports.
Why? Previous act Pearl Jam ran over by an hour, festival organizers said – and then there were long delays setting up West's elaborately futuristic stage set.
As the delay dragged on, fans at the four-day-long music festival reportedly began chanting "Kanye sucks" and pelting the empty stage with glow sticks.
A rep for the 31-year-old rapper – who, last week, had to pause his show after someone threw an object on stage – couldn’t be reached for comment.