Part 1 of Essay
is a type of music developed by black Americans about 1900 and possessing an identifiable history and describable stylistic evolution. It is rooted in the mingled musical traditions of American blacks. More black musicians saw for the first time a profession. Since its beginnings has branched out into so many styles ....

Part 2 of Essay
.... entered the mainstream, fixing the sound and the forms of our popular music for the next thirty years. Louie Armstrong closed the book on the dynastic tradition in New Orleans jazz. The first true virtuoso soloist of jazz, Louie Armstrong was a dazzling improviser, technically, emotionally, and intellectually. Armstrong, often called the "father of jazz," always spoke with deference, bordering on awe, of his musical roots, and with especial devotion of his mentor Joe Oliver. He changed the format of ....