The classically trained pianist was termed a jazz singer and a soul diva, but she's been most identified as a folk singer. [...] the film is a sloppy stitching of lethargic scenes between Simone and her assistant, Clifton (a sleepy David Oyelowo), in a French Riviera villa. Arguments over taking pills are possibly the least dramatic or important moments in a life that pulsed with and provided the impassioned tempo to the civil rights movement.