Bill and Kate Isles may look like they have a simple formula — just two harmonizing vocals and an acoustic guitar — but the depth of their music betrays the straightforward approach. The subject matter of the lyrics often contains adventurous life experiences in the form of spiritual poetry. First-rate storytelling, professional musicianship and a decades-long commitment to stage performances make this duo one of the more audience-friendly local acts. They have multiple recordings available, national and regional tours scheduled, and plan to add guest musicians Derek Birkeland on mandolin and violin, and Sarah Birkeland on upright bass, for this year’s festival.

11:30 Sat 5/7 at Teatro Zuccone