Legendary guitarist Slash (VELVET REVOLVER, ex-GUNS N' ROSES) joined CYPRESS HILL on stage last night (Saturday, August 6) at The Troubadour in Hollywood, California for the band's 20th-anniversary concert. Fan-filmed video footage of the performance can be seen below.Commented Slash: "Great getting up with CYPRESS HILL [last night]. Good people, the whole organization. Survived 20 years together in this crazy biz." Slash and CYPRESS HILL previously collaborated on a cover version of GUNS N' ROSES' "Paradise City", also featuring BLACK EYED PEAS singer Fergie (a.k.a. Stacy Ann Ferguson). Slash stated about the track in a 2010 interview, "That got an interesting response. Some people loved it; all the purists were fucking devastated I'd covered it. It was just a fun thing I did. I'd been playing that song with CYPRESS HILL for years, I always wanted to record it. Fergie was around, she's a huge Axl (Rose) fan, she came and sang it. I didn't put it on the album because I didn't want to make it look like it was really serious. So I put it on a Japanese B-side, and of course it trickled down. But it's actually a really cool version."