Very good, narration-free documentary that intercuts performance footage with interviews. This is a straight compilation film, using then-existing material. I don't think there was anything shot specifically for this film.
For such an electric talent, it is especially good that the directors just stay out of the way, and not try to staple significance, meaning or whatever to their subject. They just let Janis Joplin sing and speak for herself.
And, that's the best thing you could possibly do for a Janis Joplin doc!
******* (7 Out of 10 Stars)