There have been plenty of stories about rock stars and pop stars that flirt with death due to dangerous behaviors. But when you think of those stories, a lot of them are about guitarists that do a lot of heroin and barely make it out alive (if they don’t actually die as a result). Who you don’t think about is someone like Demi Lovato. However, in a new documentary coming to SXSW 2021, “Demi Lovato: Dancing with the Devil,” the singer pulls no punches and goes deep into the struggles she’s suffered that almost led to her death.