For two nights this February, the Nonesuch Players’ production of 9 to 5: The Musical whisks audiences back in time to the 1970s, when the grind of office life meant typewriters, landlines, lots of paper—and keeping to the status quo in which women were treated as less than their male counterparts. With a tagline of “Nothing’s gonna change if you don’t change it,” the show tells the story of three women taking charge of their own lives to make a difference—with plenty of humor, heartfelt songs, and flashy dance numbers along the way.