The lyrics of "Let's Go Crazy," the first song played in Prince's 1984 film Purple Rain, are meant to provide an inspirational lift: "If you don't like/ the world you're living in/ Take a look around you/ At least you got friends." These lines sound particularly weighty booming from massive speakers in front of an IMAX-size screen surrounded by thousands of Prince fans in Brooklyn's Prospect Park.  ARTICLE PUBLISHED: 08/07/09