Editor's Note: Nearly 50 years after his death, Louis Armstrong remains one of the 20th century's most iconic figures. In his latest book, Ricky Riccardi examines Armstrong's life in the years between 1929 and 1947 when Satchmo transformed himself from a little-known trumpeter in Chicago to an internationally renowned pop star, setting in motion the innovations of the Swing era and Bebop. The following is a selection from the prologue of Heart Full of Rhythm: The Big...