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RHYTHM
Much has been written about the role of rhythm in jazz, and about
90% has been demonstrated over the course of time to be unjustified
generalizations. For example, how many times have you heard people
say things like:
Jazz is fast and snappy. (What about all the
slow, beautiful ballads played and improvised by jazz artists?)
Jazz sounds jazzy. (A circular definition, but
the speaker probably means that jazz has a well-defined beat,
probably syncopated. Yet much contemporary jazz has shown this view
to be premature.)
The accent is always on the off-beat in jazz.
(Oh really? Which off-beat? Two? Four? So many exceptions can
quickly be though of that this observation is sadly out of date.)
Jazz swings (Well, maybe. Depends upon how you
define swing. Duke Ellington said “It don’t mean a thing if it ain’t
got that swing.” But think of Bill Evan’s Peace Piece. Does
that swing? Certainly not in the popular sense of the word, and yet
it is one of the most creative improvisations in modern jazz.
The
fact of the matter seems to be that almost any rhythm that has
occurred in any other kind of music also turns up, sooner or later,
in jazz. Maybe because jazz musicians often like to “play with the
rhythm” – experiment around and see what they can come up with.
Despite what I have just said, it is still probably true that jazz
pianists use more “off-beat” accents than other pianists, and more
syncopation, and more anticipation and delay techniques.
For example, take a simple melody like Billy Boy:

A jazz musician might alter the rhythmical structure in the
following way (or a thousand other ways):

It is
obvious that a jazz pianist has at his option thousands of rhythmic
possibilities, and the best way to develop these possibilities is
to:
1. Listen to other pianists, in person and on
recordings.
2. Experiment with a wide variety of
rhythmical patterns.
3. Take a good course in rhythm such as the
one mentioned below:

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