Rees told that Newman's score was as "grand as anything he would ever do", rather than composing the music differently due to the medium being animation. He wove death, joy, love, loss, and struggle into the work. Newman's composing style was influenced by his philosophy that behind every "chord of joy" lies an element of sadness, whether it being the knowledge it won't last forever, that it is a facade for a deeper emotion, or that joy itself comes from sadness. He used lush strings in the opening scenes to convey a sense of longing. As the characters are introduced, the score becomes more lively, and each character has their own theme, influenced by their personality. For example, Kirby is a grumpy and old vacuum cleaner, and so Newman provides a theme consisting of low chords, whereas Radio was given a brassy fanfare to reflect his self-important personality. These musical motifs wove their way into the entire movie score.