Film scholar Jane Feuer has argued that the Hollywood musical is a politically conservative genre, a notion challenged by the Warners musicals of the 30s, Bells Are Ringing (1969), and this exuberant, underrated 1957 movie. Adapted from George Abbott’s Broadway hit, it concerns a strike in a pajama factory, with Doris Day as the shop steward and John Rait as her boss. Though the sexual politics are far from progressive, this is the sort of labor musical that inspired Jean-Luc Godard’s admiration. Bob Fosse’s airy choreography is terrific, and so is the score, which includes “Seven and a Half Cents” and a steamy “Steam Heat.” Stanley Donen directed with verve and energy. 101 min.