1940s Americana isn't typical sketch-comedy fodder, but that doesn't deter New York's Apple Sisters, who lovingly recreate the radio era onstage with endearing chemistry and a host of solid musical numbers. In the show, the Sisters broadcast their witty tunes directly to our brave boys fighting Nazi Germany, interspersing the music with slapstick choreography and live commercial breaks à la Amos 'n Andy. Sarah Lowe, Rebekka Johnson, and Kimmy Gatewood bring impressive improv pedigrees to the production, along with an ironic sense of history reminiscent of an outdated public-school textbook, and a special lethal admonition for the Valentine holiday: Be mine or else!