With each progressive sun-drenched songwriting session, Colbie Caillat further masters the California coffeehouse sound that’s her birthright. And though she’s penned many singles about falling headlong into giddy infatuation, several songs on Caillat's third studio release, All of You, elevate her understanding of romance to more mature plateaus — including “Shadow,” “I Do,” and “Brighter Than the Sun,” which tells the story about a personal relationship.