As many have said there's a lot to "Jazz."
It's important to know that there's right now like 5 factions of jazz.
Traditional (Miles Davis, Charlie Parker, Thelonious Munk, Cannonball Aderly)
Contemporary a.k.a. Smooth (Chris Botti, Richard Elliot, Norman Brown, Pieces of a Dream)
Chill - a new format (Praful, Mocean Worker, Camiel, Soel)
New Age (Keiko Matsui, Acoustic Alchemy, Craig Chaquico, Third Force)
Quasi jazz - Light jazz (Kenny G (puke), Vanessa Williams, Donny Osmond, Anita Baker)