What is music? It’s a simple question, but it leads director Christopher Pomerenke in many complicated artistic and scientific directions in his documentary The Heart Is a Drum Machine, out Tuesday on DVD.

It’s an expansive, inviting film, which embraces everything from Voyager’s Golden Record and aboriginal funeral chants to brain-music therapy and pop music branding. Along the way, Pomerenke’s mostly unassuming movie is enhanced by interviews with artists, scientists and others deeply invested in charting the pathways of the heart, the prenatal vibration that establishes our musical universe, as well as the mind that modifies those vibrations into meaning.

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