Colbie Caillat, you know her, she had a hit single on a few Billboard charts with "Bubbly".... Yep, that Colbie Caillat. Well, she recently went country and formed the group Gone West, along with her fiancé Justin Young and frequent collaborators Jason Reeves and Nelly Joy. Thier new single is called "What Could've Been", and as Colbie told PEOPLE, the song looks back at a failed relationship. What do you think about this new song?