Jazz has been called "America’s Classical Music" and America's only true art form. It has been and will alway be my first choice in music. The reason is as follows.......

Perhaps the most important and most difficult element to master (many, many players, in fact the great majority, spend their lives working and developing this aspect of their playing) is improvisation. Again, simply put, this is the jazz players ability to instantaneously compose, edit, revise and perform. It is the single, most important element by which jazz players are judged and by which they establish their claim to immortality. It is an incredibly complex procedure that encompasses every element of not only jazz but of music itself. It is what makes jazz, jazz. Again, jazz is not the only music to use improvisation, but it uses it to an extent far greater than any other style of music. Through improvisation, the individual player expresses himself/herself at that very moment. P&G you should buy a copy. Find a very quiet place to listen, put it on and just listen.

Interesting history. YouTube - Miles Davis - Kind Of Blue / Made In Heaven [pt I]

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….