WATCH: Rudimental And Jess Glynne Perform 'These Days' On Classroom Instruments

How do they even make this sound dope?

When we say "big summer anthems", who are the two people you think of? Yup. It's Rudimental and Jess Glynne, isn't it?

And when we say "kids' instruments", you probably don't think of Rudimental or Jess Glynne, do you? Until now.

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The hitmakers swung by to visit Marvin Humes and Jess Glynne on The Official Vodafone Big Top 40 to chat about their brand new song, 'These Days'.

Rudimental and Jess Glynne on BT40

What we weren't expecting was for them to get so carried when we left out some classroom instruments, including some dodgy maracas that cost us 50p, and a blue recorder. (Like, who's even played a recorder since they were seven-years-old?)

Somehow, though, the five of them took over the microphones and made their rendition of 'These Days', using nothing but rubbish, plastic instruments, sound pretty amazing.

> Where Will 'These Days' Peak In The Charts? Check Out The Official Vodafone Big Top 40 Now!

You thought that was impressive? Wait until you hear Sigrid's rendition of Bieber, in Norwegian...