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Ahead on the 4/30 Maddow show

Tonight's guests include:

Heidi Hartmann, founder of the Institute for Women’s Policy Research

John Harwood, CNBC chief Washington correspondent and political writer for The New York Times

While watching tonight's video preview, take a listen to tonight's soundtrack. (Just be sure to allow the ad below to play out entirely before starting the song)

Executive producer Bill Wolff shares a preview of tonight's show: