The 'Lord of The Rings' films took the world by storm in the early 2000s, and so you may excuse a low res video below taken form the DVDs. Both videos cover how sound design and recording was used on the films, with many unorthodox approaches and details to look out for. The commentaries have been pulled from The Lord of the Rings: Motion Picture Trilogy Blu-ray. Here are the timestamps:
00:00 THE WATCHER IN THE WATER
Here's a short doc from the DVDs themselves: