“I sing because I can experience a lot of feelings…” Janis Joplin had no one to hear her feelings. The most chilling part of Amy Berg’s documentary, Janis: Little Girl Blue, is to witness the cold formality of Mother and Father Joplin. No one could miss Janis’ hunger for love. Less obvious were the roots of that hunger: the trauma of a childhood with impenetrable parents. Dorothy and Seth Joplin, in their uncanny similarity to Grant Wood’s "American Gothic” farmer with pitchfork and wife, were emotionally remote and had no warmth. Neither could hear Janis’ feelings of loneliness and hurt. Janis...