VENICE, Italy (AP) — A new documentary about Janis Joplin discusses how Joplin blazed a trail in rock when it was a male-dominated industry, but one thing the filmmaker admits is lacking from it is female perspective. Director Amy Berg of “Janis: Little Girl Blue” says she wanted to interview female performers from Joplin’s era, but most of them turned her down. Berg says Grace Slick of Jefferson Airplane did not think that people want to see how she looks today. Berg does interview Joplin’s former bandmates and other 1960s musicians. Cat Power reads letters Joplin sent to her parents. “Janis: Little Girl Blue” is currently playing at film festivals.