Music can unite people from across cultural and geographic boundaries. For proof, look to the members of the McKasson/McDonald/McLane Trio: Scottish fiddler Ryan McKasson is based in Tacoma, Wash.; guitar and mandolin player Eric McDonald lives in Portland, Maine; and accordionist Jeremiah McLane is rooted in Strafford, Vt. Despite the distance, the three performers share a commitment to traditional Celtic, French and New England music. The trio hits all the right notes in a faculty concert for the Upper Valley Music Center, a nonprofit community music school in Lebanon, N.H., where McLane is an instructor.