Ylvis' 'What Does the Fox Say?' lyrics helpfully provided on 'Today'

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Norwegian brothers Bard and Vegard Ylvisåker have become internet sensations with their absurd, catchy tune "What Does the Fox Say?" -- so big, in fact, that "Today" booked them for its Toyota Summer Concert series, which the two say was the secret plan all along.

"This was our plan. This is the main goal. We were sitting back home in Norway, thinking if we were going to perform this on 'Today Show', how were we going to do it? So then we made the song about the fox," says Vergard.

During the performance (video above), the plaza was full of youngsters and old people alike, getting their grooves on to the bizarre song. Helpfully, the guys provided the lyrics to the song, playing along the bottom of the screen.

And when asked what they follow up the song with, the guys joke that people have suggested the giraffe. So perhaps we'll all be wondering "What Does the Giraffe Say?"

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Photo/Video credit: NBC