It’s easy to talk about an artist’s growth as a series of musical decisions: an expanding sonic palette, a change in mood or tempo, an escape from the trappings of genre. It’s harder to talk about an artist’s personal—or even spiritual—growth, because that kind of progress is hard to track. Until, that is, an album like Y La Bamba’s Ojos Del Sol comes along and screams of radical transformation on every level. The Portland act’s fourth offering is a sweeping, playful and vulnerable collection that’s ripe with both musical and personal discovery.