Metallica isn't metal anymore. They're plastic.

At least they were for Jimmy Fallon and The Roots. The band took their turn at Fallon's "Classroom Instruments" bit, where artists sing their hit songs accompanied by kazoos, toy drums and horns and every other silly noise-making device you can think of. And truly, you've never experienced Metallica's 1991 hit Enter Sandman until you've heard it with kazoos.

Watch the full song below.

Can't see the video? Click here: