The biggest and brightest of the disco stars, Donna Summer was the female face of the genre in the late ‘70s. Her theatre roots helped her convey character and drama to her biggest hits, like the strutting disco pomp of “Bad Girls” and the later “She Works Hard for the Money”. Her voice frays with passion on the rock-powered “Hot Stuff,” but she tells all with little more than a sigh on the billowing slink of “Love to Love You Baby”. Scale the heights of “I Feel Love” to see the future of dance music, but Summer provides the real heartbeat under that electronic pulse.