"Monster" is an orchestral piece on the Via Domus soundtrack. It plays at the beginning of "A New Day".
Elliot Maslow surveys the beach around noon the day after the crash. As he looks over the peaceful scene, he is disturbed by a shaking of trees and birds flying away in the jungle behind him. Suddenly, Jack Shephard, Kate Austen, and Charlie Pace burst from the trees, running from what Charlie dubs the "monster".
The game's Main Theme plays briefly at the beginning of the composition.