I would usually think of Janis as a bit overrated. She had an ability, though. This is a famous concert. I’m quite amazed that every performance from it isn’t strongly copyrighted by affiliates of youtube. I thought that Cass Elliot’s reaction to the song was pasted in, because it seemed like sunlight on her face at first, but I think it’s just good lighting, besides which they were probably more likely to have the real reaction to the song back in 1967.