John Mayer performed an intro of Grateful Dead‘s ‘Dark Star’ before transitioning into ‘Your Body Is A Wonderland’ during a show in Chicago last week.Back in 2015, the pop-rock star began performing as the touring guitarist for Grateful Dead’s offshoot supergroup Dead & Company – consisting of Grateful Dead members Bob Weir, Mickey Hart and Bill Kreutzmann alongside Mayer, Oteil Burbridge and Jeff Chimenti.The link-up has led to tongue-in-cheek speculation about potential mash-ups of their respective back catalogues over the years.Mayer finally delivered during his show at United Center in Chicago, Illinois last week (October 18).“I’m not going to set it up, this is going to be the weirdest thing you ever saw in your life and I’m proud to do it,” Mayer said (via Rolling Stone).“I want you to mark it on the setlist that this is technically ‘Dark Star.’ And I’m going from ‘Dark Star’ into this next song. It’s a transition.