Amanda Walther and Sheila Carabine met in high school music class. Blonde Amanda, the “da” in Dala, sings soprano, while brunette Sheila, the “la” in the group’s name, sings alto. Visually and vocally, they’re a perfect blend. The Toronto duo’s fourth CD shows how much the girls have grown since first singing Neil Young covers and opening for the likes of Jann Arden and Tom Cochrane. Piano ballads “Crushed” and “Horses” and upbeat tunes like “Levi Blues” and “Northern Lights” are refreshingly breezy folk pop.