Joan Jett cut a massive figure in rock and roll, starting in the nineteen-seventies and continuing with a string of hits including “I Love Rock and Roll,” “Bad Reputation,” “Crimson and Clover,” and others. Jett was kind of glam, kind of punk, and eventually just classic rock. But she was one of the first women of any style or genre to break through as a leader: she hired the band, played the guitar, wrote the songs, and sang them. She came to influence a whole generation of female rockers who wanted to be as fully empowered as she was—not to mention fans like The New Yorker’s Sarah Larson. Larson spoke with Jett on the occasion of a new documentary, “Joan Jett: Bad Reputation.” Plus, Donald Trump says trade wars are “easy to win.” Will they help the Democrats win the midterms?