Slash, Chad Smith and Chris Chaney joined Post Malone‘s headline New Year’s Eve concert for closing renditions of classic Black Sabbath and Alice In Chains songs.Malone, who wrapped Bud Light’s NYE concert event at MGM Resorts in Las Vegas on Thursday (December 31), enlisted the rock legends for a couple of roaring covers.Red Hot Chili Peppers‘ Chad Smith and Jane’s Addiction‘s Chris Chaney joined first for a cover of Alice In Chains 1993 single ‘Rooster’, before Guns N’ Roses‘ Slash took to his