Moonrise Kingdom opens with Britten's Young Person's Guide to the Orchestra. Similar to Prokofiev's Peter and the Wolf (a version narrated by David Bowie, part 1 with the character introductions), the Guide uses a narrator to identify the principal instruments.
The movie closes with (non-plot spoilers):
Narration of Alexander Desplat's The Heroic Weather-Conditions of the Universe by actor Jake Ryan. Also animated readings from the juvenile novels created for the movie.
Narration of Alexander Desplat's The Heroic Weather-Conditions of the Universe by actor Jake Ryan. Also animated readings from the juvenile novels created for the movie.