Binaural Recording, Room Tone, and Voices from the Past: Sam Green on His Documentary 32 Sounds

When it came time to title his 2018 documentary about The Kronos Quartet, director Sam Green chose A Thousand Thoughts. Referring to an older Kronos composition, the title also spoke to the film’s approach, which was to use the music and biography of the Bay Area classical group to summon up a range of allusive meditations on ephemerality, culture, legacy and death. For his latest documentary, ostensibly about the much larger and more amorphous topic of “sound,” Green has gone in the numer...