Colbie Caillat has sung about plenty of love's triumphs, yet the SoCal singer/songwriter is no stranger to its tribulations. Where the beach pop number “Fallin' for You” transforms budding romance into a fizzy drink bursting from its bottle, an acoustic ballad like “When the Darkness Comes” finds Caillat's sweet and clear voice turning sombre, like a blanket of storm clouds over the Pacific.