Lilith Fair: Building a Mystery, the feature-length documentary about the late ‘90s festival, will debut on Hulu September 21st. It features interviews with festival founder Sarah McLachlan, original Lilith Fair artists Bonnie Raitt, Sheryl Crow, Paula Cole, Jewel, Natalie Merchant, Indigo Girls and Emmylou Harris, plus Brandi Carlile and Olivia Rodrigo.