Watch This! Simon Cowell Favorites Collabro Sing A Cappella Version of 'A Thousand Years'

So this is what it sounds like when an a cappella group does a cover of a Christina Perri hit.

"Britain's Got Talent" winners Collabro, who were signed by Simon Cowell, did a brilliant cover of Perri's "A Thousand Years" in an exclusive web video for "Extra."

Check it out!

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