- Walter Murch is a pioneering sound designer who won an Oscar for his work on Apocalypse Now. He developed a technique of layering up to 5 conceptually similar sound tracks to maintain clarity in dense, complex scenes.
- For the famous helicopter scene in Apocalypse Now, Murch prioritized dialogue and effects over music to drive the intensity. He conceived of a spectrum from encoded sounds like dialogue to embodied sounds like music.
- Murch stressed the importance of varying density and energy levels over time to engage the audience rather than exhaust them. He would take visual notes on desired energy when reviewing scenes.