Our latest guest on Soundtracking is the legend that is Sean Penn, who joins us to discuss his role in Paul Thomas Anderson's One Battle After Another. Also starring Leonardo Di Caprio, Regina King and former Soundtracking guest, Benicio Del Toro, One Battle After Another tells the story of an ex-revolutionary who must rescue his daughter from a corrupt military official, played by Sean. We discuss his stellar performance, but also how important music has been to him in his own filmmaking.