A crashing wave is truly the best analogy I can come up with for how I hear it.

The technical skill required to execute great jazz is nothing short of remarkable.

The ability to improvise within the complex arrangements to accentuate the expressions is pure genius. A great Jazz player has to have command of so many musical attributes at the same time.

>2) what about other genre's that incorporate improvisation?
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You can be more specific? Which other genre's do you see a lot of improvisation in?