Scott Walker: 30 Century Man is the latest in a mini-wave of pop-music docs, like The Devil and Daniel Johnston, that try to inflate cult figures into lost geniuses. In the '60s, Scott Walker had a spooky, canyon-deep crooner's voice that made him the missing link between Perry Como and David Bowie. As part of the Walker Brothers (known for ''The Sun Ain't Gonna Shine Anymore'') and then in his solo albums, Walker forged an out-of-time mystique that is vividly captured here. Then he vanished, returning as a creator of avant-apocalyptic electronic dirges that the film tiresomely rhapsodizes over. B–

