Radiohead were forced to leave the stage twice during their Coachella headline gig because of sound issues.
The band were the top-billed act on the opening day of the Californian festival, but were plagued by problems including the sound cutting out completely, and audio feedback at the beginning of their set.
After the second time that the band left the stage while the issues were resolved, frontman Thom Yorke reappeared and made a joke about Radiohead's reputation for being downbeat.
He quipped: "I'd like to tell a joke to lighten the mood.
"But we're Radiohead so f*** it."
Fans vented their annoyance about the slip-ups on social media.
One tweeted: "Very disappointed that Coachella messed up Radiohead's sound. I've been waiting my whole life to see them."
Another added: "Coachella have murdered Radiohead's set. Sound has cut out 3 times and now all you can hear is bass. #disaster."
Someone else wrote: "Radiohead deserved better Coachella .... hope the sound engineers learned something tonight."
One person thought that UK festival Glastonbury would not let such an accident happen.
They tweeted: "You wait for that magical last verse of Let Down, & the sound drops out just for that minute. Roll on Glastonbury."
However, others praised Radiohead for keeping their cool.
One person tweeted: "Sound tech issues aside, @radiohead played an amazing set. So good the speakers couldn't handle it."
Someone else tweeted: "Shame everyone is focused on sound problems in @Radiohead #coachella set. Seriously it was about 4mins out of 2hr+ show. THEY WERE AMAZING."
Another fan tweeted: "Awed by @radiohead, acted like perfect English gents during @coachella's unfortunate string of sound failures. You melted my face and heart."
Coachella Valley Music and Arts Festival takes place in Indio, California, over two consecutive weekends with the same line-up at each event.
Saturday's headliner is Lady Gaga and Sunday's is Kendrick Lamar, with Radiohead returning on Friday.