Read this: Every Iron Maiden album ranked from worst to best
Explaining how he came up with the musicality and how it's not actually just a straight-up cover song, he continues: "I know some of you consider this sacrilegious, especially when this is not basic 1:1 cover. You're entitled to your opinion. But it's not what I like to do.
"I like to put in my creativity, make it different somehow. The riffs and stuff are not the same, because I don't think that's how Maiden would've done it if they made this. I wanted to capture the essence of Iron Maiden with each instrument and as a whole. Hope you dig it!"
It'd be interesting to know what either band think of this mash-up. While Maiden frontman Bruce Dickinson has previously backed his band as "better than Metallica", ’Tallica drummer Lars Ulrich responded to The Guardian in 2014: "I will never argue with that. I will always support Bruce Dickinson in whatever nonsense he says. That's part of the fun. So go Iron Maiden! It's fine."
Hear Enter Sandman in the style of Maiden below: