promised Cameron that he would not work on any other project except for Avatar and reportedly worked on the score from four in the morning until ten at night throughout the process. He stated in an interview, "Avatar has been the most difficult film I have worked on and the biggest job I have undertaken." Horner composed the score as two different scores merged into one. He first created a score that reflected the Na'vi way of sound and then combined it with a separate "traditional" score to drive the film. British singer Leona Lewis was chosen to sing the theme song for the film, called "I See You". An accompanying music video, directed by Jake Nava, premiered , 2009, on MySpace. Themes and inspirations Avatar is primarily an action-adventure journey of self-discovery, in the context of imperialism, and deep ecology. Cameron said his inspiration was "every single science fiction book I read as a kid" and that he wanted to update the style of Edgar Rice Burroughs' John Carter series. He acknowledged that Avatar shares themes with the films At Play in the Fields of the Lord, The Emerald Forest, and Princess Mononoke, which feature clashes between cultures and civilizations, and with Dances with Wolves, where a battered soldier finds himself drawn to the culture he was initially fighting against. He also cited Hayao Miyazaki's anime films such as Princess Mononoke as an influence on the ecosystem of Pandora. In 2012, Cameron filed a 45-page legal declaration that intended to "describe in great detail the genesis of the ideas, themes, storylines, and images that came to be Avatar." In addition to historical events (such as European colonization of the Americas), his life experiences and several of his unproduced projects, Cameron drew connections between Avatar and his previous films. He cited his script and concept art for Xenogenesis, partially produced as a short film, as being the basis for many of the ideas and visual designs in Avatar. He stated that Avatar "concepts of a world mind, intelligence within nature, the idea of projecting force or consciousness using an avatar, colonization of alien planets, greedy corporate interests backed up by military force, the story of a seemingly weaker group prevailing over a technologically superior force, and the good scientist were all established and recurrent themes" from his earlier films including Aliens, The Abyss, Rambo: First Blood Part II, The Terminator