Jazz is a living conversation: music born of disparate histories and ongoing dialogues between individual expression and collective form. It is both a set of practices—rhythmic swing, improvisation, call-and-response—and a cultural language that refracts social history, identity, and technology. To understand jazz is to trace how expressive choices (tone, rhythm, timbre, space) carry social meanings, how standards and repertoires function as common grammar, and how artists continually reshape tradition. 1. Origins and Early Forms Jazz emerges from African diasporic musical practices in the United States—work songs, spirituals, blues, ragtime—and from European harmonic and instrumental traditions. New Orleans is often invoked as a crucible where marching band brass, Creole culture, and dance-hall entertainment met. Early jazz foregrounded collective polyphony: several lines improvised around shared harmonic frameworks.