The U.K. grime star Stormzy staged an epic Glastonbury Festival set on Friday night, but the real star of the night was out in the crowd.

Tara Asher is a British Sign Language interpreter, and -- according to the BBC's Colin Paterson -- is also one of only four who specializes in signing grime. On Friday, Asher brought her talents to Stormzy's Glastonbury set, where she translated his entire set into BSL.

(For anyone who might not know, "grime" is a musical genre born in the U.K. that's like a blend of dancehall and hip hop.)

Asher's performance -- there's no better word to describe her contribution to the show -- is a delight. She apparently spent an entire day rehearsing for each of the songs she performed. It shows.

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(Also, credit where it's due. FYI....)

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