The Metallica guitarist pulled out his '59 Les Paul, Greeny, for the surprise performance
The two sat down for a “mid-tour natter” during Metallica’s current WorldWired European stadium trek.
The band dug up the 'St. Anger' classic for the opening night of their latest run of WorldWired tour dates.
The show will be the first concert at San Francisco's Chase Center, and will mark the 20th anniversary of 'S&M.'