DR. JOHN Shunning boomer reverence, the Night Tripper Mac Rebennack casts a voodoo spell of leathery leering vocals, slithery funk, raunchy N'awlins R&B and Creole gumbo mojo. Chances are, Dr. John's swampy alchemical orgasm has touched you already, whether you were in the "Right Place, Wrong Time" for his sole hit in 1973; have been to Bonnaroo, which takes its name from his 1974 ode to hedonism, Desitively Bonnaroo; or (re)discovered him as a spiritual activist on Locked Down, his 2012 collaboration with The Black Keys' Dan Auerbach. Spanning genres and generations, the Big Mac swallows disparate musical styles whole and transforms them. Inexplicably opening for jam-band nonentities Gov't Mule, the good doctor is that rare living legend who can still shake your ass and fry your mind. $32/$45.35. Time Warner Cable Uptown Amphitheatre.