Kelly Rowland's rendition of the American National Anthem left 80,000 soccer fans in agony on Wednesday night, after a technical glitch turned her singing into a high-pitched garbled mess.

The former Destiny's Child star was flown to London at the last minute to kick off a friendly match between the USA and England at the British capital's Wembley Stadium.

But the sound system at the new venue failed as soon as she started singing, and left the famous Stars and Stripes anthem virtually unrecognizable.

A matchgoer tells WENN, "She looked like she was really struggling to stay in tune. The PA system seemed to drop out at times and the high notes were really terrible. People were covering their ears."

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(This news article provided by World Entertainment News Network)