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It is true. The text mentions atonality, multiphonics, and collective improvisation as techniques related to the free jazz movement.

As the name suggests, freedom is the central theme of free jazz. Free jazz aims to promote more expression freedom through unrestricted improvisation. Free jazz is a notoriously tough genre to define because each musician expresses themselves uniquely, which is only natural. It's not focused on any one specific quality or method.

Free jazz is the deliberate rejection of established musical standards and guidelines in favor of individual expression.

The entire Modern Jazz movement is moving toward more improvisational freedom. This was accomplished by downplaying the significance of chords. Because chords require you to operate within a predetermined harmonic framework, they limit your ability to improvise.

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