I went to watch this with a friend at the International Film Festival in Berlin. She knew Kate McGarrigle, but I had no idea who that was supposed to be. The "documentary" (it's essentially a concert show that got filmed) is fine indeed. And there was a very personal Q&A after the movie was screened too (pretty sure you can find footage of that somewhere on the internet).
You can't rate this like a conventional movie then. It is a concert and while I was afraid I might get bored watching this (during the festival I did watch 3-5 movies a day), that didn't happen. But you should like the music she was making, otherwise you won't have a good time, that is for sure! So if you don't know her either, look her up, if she sounds interesting, watch this and enjoy
You can't rate this like a conventional movie then. It is a concert and while I was afraid I might get bored watching this (during the festival I did watch 3-5 movies a day), that didn't happen. But you should like the music she was making, otherwise you won't have a good time, that is for sure! So if you don't know her either, look her up, if she sounds interesting, watch this and enjoy