Jazz, born in late 19th-century African American communities, blended African and European musical traditions. It emerged from New Orleans' cultural melting pot, incorporating elements like polyrhythms and improvisation, spreading through the Great Migration and early recordings. Key figures like Louis Armstrong, Duke Ellington, and Miles Davis shaped jazz's evolution. The genre's characteristics include improvisation, swing rhythm, blue notes, and extended chord harmonies. Jazz spawned various subgenres, from Dixieland to bebop, influencing culture and breaking racial barriers.