Watch Metallica's 'Battery' Go Bluegrass: Banjos, Tractors & Overalls

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James Hetfield of Metallica performs during Rock in Rio USA at the MGM Resorts Festival Grounds on May 9, 2015 in Las Vegas, Nevada.

On their new album Wilder Mind, Mumford & Sons lost their banjos. It looks like Metallica found them.

Okay, this rendition of "Battery" was not actually done by Metallica. It was done by YouTuber Rob Scallon, who has previously posted a bunch of metal covers and instructional guitar videos to his account. Here, Scallon and his buddies give the Master of Puppets track the bluegrass treatment, with the double bass kick intact.

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While we're talking viral metal cover videos, how do you think it compares to these kids doing an all-percussion version of "Crazy Train"?