I've heard that the band performing this version of Metallica's "Enter Sandman" was performing at a wedding, which (were it true) would make this video 100% better, particularly if it were done without the wedding party's knowledge.
In any case, this is a pretty quality version of the Metallica standard, and it makes me long for more jazzy, relaxed covers of metal songs—similar to what Andy Rehfeldt does on his YouTube channel.
Just, y'know. Without vocals.
(P.S.: Rehfeldt appears to have done a metal version of "Call Me Maybe," as well as a less-angry version of Rage Against the Machine's "Killing in the Name," which has instantly turned me into a new fan of his.)