Stormzy has said his Glastonbury set was “the most difficult thing” he’s ever done.
He said it left him believing it was his worst performance to date.
The star said it was only later, after speaking to the festival co-organiser Emily Eavis, he realised that it had gone “all right”.
Stormzy told Q Magazine: “The thing about Glasto, and I’ve not told anybody this, but I had no sound.
“My in-ears blew after about 20 minutes, so I had no sound for the whole thing. It was the most difficult thing I’ve ever done.
“When I walked off stage, I thought I’d f***** it. I thought it was the worst thing I’d ever done.
“I came off stage and thought I’d totally, absolutely, blown it. I was crying for, like, an hour. I was in hysterics.
“I thought I’d f***** it up. Heartbroken, man. Heartbroken. Then after calming down for an hour, some of the people at the festival, Emily Eavis and that, gave us a memory stick to watch it back.
“And I got about halfway through and I was, like, ‘S***, I think it all went all right’.”
Earlier this week the singer revealed his second album, Heavy Is the Head, will be released on 13 December.
He will be performing at the Global Citizen award ceremony – an event which recognise activists working to end extreme poverty – on the same day his new music drops.
Stormzy, whose real name is Michael Omari, posted an image of the album’s cover art on his official Twitter page, showing him wearing a crown and holding the Banksy-designed Union Jack stab vest he wore at Glastonbury.
He used the performance to highlight racism in the arts, racial profiling, knife crime and politics.
During his set he sampled a speech by Labour MP David Lammy about racial prejudice in the criminal justice system, and crime statistics flashed across big screens behind the dancers.
Stormzy told the packed crowd on the night, “this is the most legendary night of my entire life”.
Looking back on his achievement, he called the performance “significant”, calling it the “absolute summary and epitome of everything” he has done so far in his career.
Arts & Entertainment reporter @BethanyMinelle Stormzy has said his Glastonbury set was “the most difficult thing” he’s ever done. The 26-year-old rapper, who headlined the Somerset festival earlier this year, revealed a tech failure caused his in-ear monitor to stop working – just 20 minutes into his show.