The late folksinger Phil Ochs burned bright in the 1960s, on fire with songs of protest while his competitor, Bob Dylan, sang of attitudes blowin’ in the wind. But drink and instability overwhelmed Ochs, and he died, a suicide by hanging, in 1976. He was 35. Kenneth Bowser’s fine, deeply researched documentary Phil Ochs: There But for Fortune, filled with commentary from unusual suspects, is at once an unsentimental portrait of the ambitious singer who thought himself bound for glory, and an affecting elegy for a time when song was a form of revolution. A?