Full disclosure: I’m interviewed in this documentary. And it’s impossible for me to be objective about Papa Grows Funk. I watched this band from its inception and was a fan (I don’t mind saying it) of keyboardist/vocalist John Gros, guitarist June Yamagishi and drummer Russell Batiste long before the group got started. They were immediately a New Orleans supergroup, with connections from the Meters (Gros with George Porter Jr’s band, Batiste with the funky Meters), the Wild Magnolias (June) a...