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AJ Schnack’s “Kurt Cobain: About a Son” benefits from not song or music but voice: Cobain’s own, drawn from more than twenty-five hours of audio recordings of interviews by journalist Michael Azerrad, author of “Our Band Could Be Your life: Scenes from the American Rock Underground 1981-1991.” Schnack was reportedly blocked from use of any Cobain songs by his widow, Courtney Love, and the impressionistic result, with music from musicians who had influenced him, such as R.E.M. and Mudhoney, assembles footage of Pacific Northwest everyday-ness, of landscapes and anonymous figures moving through them. There is an elusive yet genuine power to it all. Cobain thought a lot: listen while you look. 97m. (Ray Pride)