CHICAGO, IL - JULY 31: Paul McCartney performs during the 2015 Lollapalooza Music Festival at Grant Park on July 31, 2015 in Chicago, Illinois. (Photo by C Flanigan/FilmMagic,)
CHICAGO, IL - JULY 31: Paul McCartney performs during the 2015 Lollapalooza Music Festival at Grant Park on July 31, 2015 in Chicago, Illinois. (Photo by C Flanigan/FilmMagic,)