Division champs, a top 10 world-ranked quartet and San Juan Island’s own barbershop masters bring sweet harmonies to San Juan Community Theatre Sunday, June 2, at 2 p.m.

Celebrating its 15th year in Friday Harbor, Barbershop Bonanza has grown into a popular Sunday afternoon medley of contemporary and old-time favorites honoring this uniquely American music with four-part harmonies.

Hosted by San Juan’s mixed barbershop chorus, Island Chordsmen Plus and featuring the island’s local women’s a cappella ensemble, Sound Vibrations, (both directed by Angel Michaels), the Bonanza adds two mainland groups this year to complete the entertainment.

Based in Bellingham, the men’s a cappella chorus Mount Baker Toppers recently won the 2013 Evergreen District Division I championship in British Columbia. The Toppers perform a variety of musical genres including pop, doo-wop and gospel.

Ranked 9th best barbershop quartet in the world in 2012, Via Voice also scored the highest in the quartet division at the Evergreen District finals this year. The Pacific Northwest group’s 4-part harmony styles include arrangements that infuse traditional barbershop with ’40s and ’50s jazz, and ’60s and ’70s rock.

Tickets, $18, festival seating. Info, 378-3210,www.sjctheatre.org