1

At around 1:44 of the acoustic cover of Taekwondo by "Walk of the Earth", the musicians play a blowing instrument.

the musicians play a blowing instrument

What instrument is this?

3

The instrument she's miming (not particularly convincingly) at 1.44 is a Kazoo. They both play them at 2.47, when we get a better view of his.

It's a variation on the 'comb and paper' principle. Not so much blown as hummed into. There's a paper or plastic membrane and a resonating chamber. Available in all good music shops at minimal cost.

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3

That’s a kazoo. It’s more of a humming instrument.

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