"Lost Horizons" opens with "Elements", which "blends acoustic guitars, flugelhorns, synths, skittering breakbeat rhythms, a folksy harmonica, and ... a falsetto 'doo-doo' chorus". Overlaying the music is a voiceover, courtesy of English actor John Standing, that lists the basic 'elements' that make up the world: earth, metal, water, wood, fire, and (eventually, later in the song) sky. The second track, "Space Walk", is set to a recording of Ed White's 1965 space walk on the Gemini 4 mission. Franglen and Deakin chose to use the sample after listening to an album called "Flight to the Moon" (1969); the two were struck by how moving and emotive many of the tracks were. Deakin later said, "'One small step' leaves me cold, because it was so obviously scripted. But the spacewalk… even after hearing it so many times, it's so vivid."