If you love Metallica One but have always felt that it needed more bass, this is for you.
This bloke, YouTuber Mark Grocki, has turned one of Metallica's most loved songs into a bass-fest. Apart from the drums, everything is on bass - the rhythm, solos, melodies, vocals and the original bass - to make one hell of a heavy tune.
As for the results? Not gonna lie, it's pretty damn good.
Give it a play and let us know what you think.