Fare Thee Well, A Tribute To The Grateful Dead - Chicago, Illinois [Getty Images]

CHICAGO, IL- JULY 05: Trey Anastasio, Phil Lesh, Bill Kreutzmann, Bob Weir, Mickey Hart, Jeff Chimenti and Bruce Hornsby of The Grateful Dead perform during the "Fare Thee Well, A Tribute To The Grateful Dead" on July 5, 2015 in Chicago, Illinois. (Photo by Jeff Kravitz/FilmMagic)

FilmMagic, Inc Jeff Kravitz