With the Metallica tour on hold as singer James Hetfield is in rehab, the guys are keeping pretty busy. Over the weekend, Kirk Hammett joined UFO onstage for a couple of songs during the Megadeth "MegaCruise" pre-show. Kirk is a huge fan of UFO, and seems to have had a great time playing with one of his favorite bands.
Meanwhile, Lars joined in with Mumford and Sons and played drums on their song "The Wolf"