Watch the cast of The Super Mario Bros. Movie sing the theme song

We’re less than a month out from the theatrical release of Super Mario Bros. MovieThe cast also appeared this week at The Tonight Show with Jimmy FallonTo promote the film, they sang the Super Mario Bros. theme tune. They were accompanied by host Fallon, plus musical group (and Fallon’s house band) The Roots.

If you, like me, were confused about how a group of people were meant to sing the Mario theme song — which is entirely without lyrics — just think of the video like an early 2010s YouTube a capella arrangement. The arrangement is just like any Pentatonix video, with different performers performing various parts of the melody and beatboxing.

The segment features cute animations. Charlie Day, Keegan Michael Key and Jimmy Fallon among others pop in and out Warp Pipes alongside pixelated Piranha Plants. Jack Black is a master at scatting. Each member of the cast is shown with a colorful rectangular backdrop and sings sections while swinging a Koopa shell around. Mario creator Shigeru Miyamoto and Illumination CEO Chris Meledandri are both present (although Miyamoto takes the last notes).

It’s a twee reminder of an earlier era of YouTube, where things were simpler and a capella was king. Think of it like the Nick Pitera “One Man Disney Movie”-style medley YouTube video, except it’s the cast of Super Mario Bros. MovieYou can be heard humming the best-known theme song in video games.

Super Mario Bros. Movie Premieres in Theaters April 5.