What makes the picture fun for Dylan fans--and potentially frustrating for neophytes--is that every album and movie bears an alternate title. Ledger's Robbie, for instance, stars in "Grain of Sand," actually a reference to the Pete Seeger song. As in Haynes' glam rock reverie Velvet Goldmine, the trickery involves the entire cast. While Julianne Moore plays former lover Alice, a dead ringer for Joan Baez; Michelle Williams embodies elusive scenester Coco, i.e. Edie Sedgwick. If I'm Not There is less affecting than Control, the year's other big music film, it rewards repeat viewings like few biographical features. The soundtrack mixes originals with covers, like Jim James's heartfelt "Goin' to Acapulco." --Kathleen C. Fennessy