Jazz is different than most traditional or classical music. The three elements that set Jazz apart from all the rest are Syncopation, Complex Harmonies, and Improvisation.
Syncopation - the practice of changing the normal pattern of accents to emphasize the weaker upbeats.
Complex Harmonies - Most traditional music rarely ventures beyond common triads and seventh chords. Jazz uses 9th, 11th, and 13th chords as standard harmonies. Dominant 7th and 9th chords may even have altered intervals within the chords.
Improvisation - making up a melody on the spot for the first time while the band is still playing. Many popular rock songs will include an instrumental solo, which may have originated from a spontaneous rehearsal or jam session. Once recorded, however, listeners tend to expect the same riffs or patterns every time they hear it, even at a live concert.
Count Basie
Dave Brubeck
John Coltrane
Chick Corea
Tommy Dorsey
Duke Ellington
George Gershwin
Dizzy Gillespie
Herbie Hancock
Bob James
Wynton Marsalis
Glenn Miller
Thelonious Monk
Charlie Parker
Oscar Peterson
Wayne Shorter
Horace Silver
Art Tatum
Joe Zawinul
Chicago
Earth, Wind, & Fire
Miami Sound Machine
The Rippingtons
Spiro Gyra
Steely Dan
Pat Metheny
Weather Report
Yellow Jackets
Yes
Adele
David Bowie
Ray Charles
Coldplay
Green Day
Gloria Estefan
Dave Grusin
Al Jarreau
Billy Joel
Elton John
Alicia Keys
Chuck Mangione
Paul McCartney
Stevie Wonder