Zakk Wylde (BLACK LABEL SOCIETY, OZZY OSBOURNE) joined Slash (GUNS N' ROSES, VELVET REVOLVER) on stage for a jam last night (Saturday, November 17) at Estadio Cubierto Malvinas Argentinas in Buenos Aires, Argentina. You can watch fan-filmed video footage of the performance below.After the concert, Slash's lead singer, Myles Kennedy, tweeted, "Zakk Wylde jammed with us this evening in Buenos Aires. That guy can punish a fretboard. BLACK LABEL SOCIETY [who opened the cocert] was awesome as well." Zakk tweeted: "BIG BL LOVE To SLASH n Co.!!!! Always Great Seeing you n Listening to You TEAR it UP My BROTHER!!! BIG BL Thanks To SLASH/MYLES n The CONSPIRATORS for letting Is Roll w/Them... GREAT PEOPLE=GREAT TIMES" Slash tweeted: "Many thanks to Zakk for jamming w/us tonight. It was an honor & a privilege. iiii]; )'" In a 2011 interview with Music Radar, Zakk stated about GUNS N' ROSES lead singer Axl Rose, "I've been friends with Axl for a long time. He's the last of the great frontmen. Seriously, who else is there? You had Elvis and Mick Jagger, then you had Jim Morrison and Freddie Mercury, Robert Plant, Ronnie Van Zandt, and of course you can't forget about Ozzy [Osbourne], David Lee Roth… After all them, Axl came out, and it was like, Wow! The ultimate frontman, you know? You've gotta give it up for Axl. Amazing songs, amazing production — 'Appetite''s one of the greatest records of all time. The guy's got the whole nine yards. As a frontman, nobody's come close to him since he busted out."