Well, we'll be damned.
An insider told Life & Style:
[Image via WENN.]
The name of the game was piano at the 2014 Grammys, and even Metallica was ready to play along!
With a little help from master pianist Lang Lang, the modern metal legends did something a little different.
Ch-ch-check out the video (above) to see Metallica put the forte in pianoforte with a keyboarded up version of their classic One!