In one deeply moving scene, Jeff Tweedy from Wilco, remastering old material, separates Pops' guitar and voice tracks to play to Mavis; for a moment, he's there in the room with them and her "I miss him so much" really hits home.
But there are few such magic moments.
Edwards has a tendency to over-direct rather than trust her talent, even when that talent gives lines like "this is the best time I've had since I got my knees done", so there's sometimes a sense of boxes being ticked. Still, the survey digs up lots of footage and usefully positions Pops as a quiet driver of the civil rights movement.
There are some excellent talking heads (including Bob Dylan, shot from an inexplicably high angle so you can hardly see his eyes) who provide useful analysis of the artists' position in the social, political and musical landscapes.
It falls short of being a great film, but it's a good one, about a great singer.
Review: Mavis! Documentary
Director: Jessica Edwards Running time: 80 mins
Rating: M
Verdict: What a gal!