"Jurassic Park Theme" is the most heard theme frequently in Jurassic Park saga.
It was introduced when the visitors first saw the Brachiosaurus, and featured "gentle religioso cantilena lines", which John Williams declared was to try "to capture the awesome beauty and sublimity of the dinosaurs in nature." This theme was widely regarded as one of Williams' greatest. This theme also has various versions. One is an extended version, heard in "Welcome to Jurassic Park." The second is a much shorter and tender version that is heard at various parts of the film and simply revolves around the climax of the theme but in a much softer note. This much softer version was slightly modified and used for the score "A Tree for My Bed."