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Ahead on the 4/20 Maddow show

Happy Friday! Here's our guest list for tonight:

Bob Cavnar, author of “Disaster on the Horizon: The Story Behind the Deepwater Well Blowout” and 30-year veteran of the oil and gas industry

E.J. Dionne, columnist for The Washington Post, senior fellow at the Brookings Institution and MSNBC contributor

While executive producer, Bill Wolff gives us a preview of the show, take a listen to tonight's soundtrack.