Polyphony occurs when several meters are played simultaneously.

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The musical organization between melodies in a composition may provide a cognitive scaffold to overcome attentional limitations when perceiving multiple lines of music concurrently. Coherence may be a key difference between music and stimuli like speech, which does not rely on the integration of multiple streams for comprehension. However, multiple musical streams are processed comparatively easily.

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1UCSF Sound and Music Perception Lab, Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States.Karen Chan Barrett 1*, Richard Ashley 2, Dana L.