The Vashon jazz/post-jazz/ neo bossa ensemble Some’tet will mark the final month of the Heritage Museum’s current exhibit, “Ellisport: The Hidden History,” by playing music from 6 to 7:30 p.m. Friday.

In April 2013, guitarist and composer Michael Whitmore began a Sunday night jam session at Snapdragon Café. The jam session sometimes involved a quartet, sometimes a sextet or trio, but as the group’s website states, “always some’tet.”

Over the next few years, the jam sessions grew into a full-blown and consistent ensemble aptly named Some’tet.

Some’tet includes Barry Cooper on trumpet and flugelhorn; Kevin Nortness on saxophone; Patrick Christie on upright bass, Dodd Johnson on drums; and vocalist Christine Goering.

The exhibition, “Ellisport: The Hidden History,” tells the story of Ellisport, one of the island’s oldest communities, from its native people to its current role in island life.

The exhibit was organized by Ellisport residents who want to honor the community’s history. The group’s plan included the current museum exhibit, the Chautauqua held in Ellisport last month and for the future, a new community trail.

The exhibit closes Sept. 24. The museum is open 1 to 4 p.m. Wednesday through Sunday. Admission is by donation.