“Rene Fontaine” and “Sergei Petrov,” the credited screenwriters of this mannerist fantasy, are pseudonyms for star Bob Dylan and director Larry Charles, a veteran of Seinfeld. In fact, every character talks like Dylan, and his character, a legendary singer called Jack Fate who turns up between prison terms to perform a benefit concert, is a fanciful but recognizable version of his own persona. Set in a contemporary America that suggests an endless skid row, with such Latin American trimmings as an ongoing civil war and a dying dictator whose likeness hangs everywhere, this is at once a spin on Dylan’s mythology, an excuse to feature as many of his songs as possible, and an unblinking look at American greed, corruption, and self-absorption. And for all its pretensions and avant-garde narrative dislocations, the star-studded cast–including Jeff Bridges, Penelope Cruz, John Goodman, Jessica Lange, Luke Wilson, Angela Bassett, Val Kilmer, Mickey Rourke, and many others in cameos–keeps this buzzing. 106 min. Music Box.