it is a born musical genre at the end of the XIXth century in the United States, which expanded of global form throughout the whole XXth century.
Between many attempts of delimiting and of describing the complex phenomenon of the jazz, the critic and German student Joachim-Ernst Berendt, in its classic work Jazz: Of New Orleans to the Jazz Rock, he says to us:
The jazz is a form of musical art that originated in the United States by means of the confrontation of the blacks with the European music. The instrumentation, melody and harmony of the jazz stem principally from the musical Occident tradition. The rhythm, the phrasing and the production of sound, and the elements of harmony of blues stem from the African music and from the musical concept of afroamericans.