Slash (from Guns n Roses) play Mother Mary at Wacken with Michael Schenker - UFO Session 31.07.2025 - YouTube Watch OnSlash has made a surprise appearance during Michael Schenker’s Wacken Open Air set, with the pair joining forces for a UFO classic. But it was his retake of Mother Mary with Slash that stole the show, and the German festival was treated to a special rendition of the song. Both guitarists donned their signature axes for the occasion: Slash, a Gibson Les Paul, and Schenker, an Olympic White Gibson Flying V. Together, they produced a thick wall of sound. MICHAEL SCHENKER - Mother Mary feat. Rich Warlock, with which he started his Guns N' Roses career, has returned to auction, nine years after it was last sold.