A new book by author T.J. English, who's made a career writing about organized crime, examines the close relationship between jazz and the mob.Featuring characters like Frank Sinatra, Louis Armstrong, and Al Capone, "Dangerous Rhythms: Jazz and the Underworld" traces the popularity of the genre through the 20th century and how gangsters helped the genre flourish.We sit down with English to talk about jazz music and the mob's shared sordid and spectacular history.Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Find us on Twitter @1A.