The technique been used frequently by the jazz artist is known as Improvisation technique.
improvisation is a technique of coming up with something new on the same spot without initial plan. A good example of improvisation is when a set of actors are performing without a script.
The presence of technique of improvising is very important for jazz artists because it is been used frequently to produce genuine jazz music.
Therefore, the answer is improvisation because its allows the Jazz artist to come up with something new on the spot and leads to creation of genuine jazz music.
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