This is not a film for anyone looking for an introduction to Irish band U2's career in the 1980s, but it is a vibrant portrait of an established group making its musical pilgrimage through the America it has always imagined through blues, gospel, and early rock 'n' roll. Filmmaker Phil Joanou (Heaven's Prisoners), a veteran music-video director and maker of the distractingly kinetic Three O'Clock High, finds a suitable outlet for his high energy in this juggernaut of a journey, which finds U2 collaborating with a black gospel choir and B.B. King, recording inside the legendary Sun Records studio, dropping by Graceland, and in a moment of fearlessness, performing the Beatles' "Helter Skelter" to exorcise Charles Manson's sick claim on the song.