Taylor Swift 'I Knew You Were Trouble' a cappella cover - watch
Performed by Walk Off the Earth and featuring KRNFX, the group features vocalist Sarah Blackwood singing Swift's part, supported by backing vocals and some beatboxing.
The cover has been a huge hit, with more than 800,000 views on YouTube.
Over 37,000 users have 'liked' the Canadian group's video, which was uploaded on New Year's Day.
One YouTube commenter posted: "Love this! Can they forever replace Taylor Swift?"
Another said: "This is the best cover I've ever seen of anything by anyone."
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Listen to the original song by Taylor Swift below: