Thirty years ago, the wild success of The Joshua Tree transformed U2 into the biggest band on the planet. Radio hits “With or Without You,” “I Still Haven’t Found What I’m Looking For” and “Where The Streets Have No Name” catapulted them from arenas into stadiums and found then hobnobbing with Frank Sinatra, appearing on the cover of Time magazine and sharing the stage with Bob Dylan, Bruce Springsteen and B.B. King.