Dead & Company kicked off their 3rd summer tour in as many years on Wednesday in Mansfield, Massachusetts. Original Grateful Dead members Bob Weir (rhythm guitar, vocals) and the “Rhythm Devils” Billy Kreutzmann (drums) and Mickey Hart (percussion) have been joined by long-time Dead collaborator Jeff Chimenti (piano/keyboards), former Allman Brothers and Aquarium Rescue Unit member Otiel Burbridge (bass) and John Mayer (guitar) since the band’s inception in the fall of 2015.

For a decade and a half now, Bonnaroo has stood alone on the American festival scene. Although other American festivals have higher annual attendance (Lollapalooza regularly breaks 100,000) or pull rarer gets (even entering its tamer years, Coachella still reigns supreme for reunions), only...