In Part Two of Tom Reney's conversation with Ricky Riccardi about his new book, Heart Full of Rhythm: The Big Band Years of Louis Armstrong, Riccardi discusses Armstrong's skirmishes with Prohibition-era gangsters and managers; the trumpeter's triumphant return to his birthplace of New Orleans in 1931; and the massive archive of self-documentation in letters, scrapbooks, and tape recordings that Armstrong left for posterity.