This fascinating documentary profiles Willie Mae “Big Mama” Thornton as a blues powerhouse who shook American music to its core. Towering in voice and presence, she made “Hound Dog” a #1 hit before Elvis ever sang it, and her ferocious “Ball & Chain” launched Janis Joplin’s career. Defying gender norms in jeans, boots, and cowboy hat, Big Mama captivated audiences with raw energy, humor, and soul. From Alabama juke joints to European festivals, she lived hard, sang harder, and left an indelible mark on rock, R&B, and the blues.