In this 1957 biography film of the jazz-great Louis "Satchmo" Armstrong, he and his band tour the world as American good-will ambassadors bring jazz at its best to the people of the world. Within the film, the life of Louis Armstrong is portrayed through the music. One of the outstanding scenes in this "biography/docudrama" shows blind songwriter W. C. Handy, with tears streaming down his face, as Armstrong, backed by Leonard Bernstein leading the New York Philharmonic Orchestra, play Handy's immortal "St. Louis Blues."