The Northeast Kingdom Classical Series entices chamber music lovers with a soul-stirring performance by Poland’s distinguished Boarte Piano Trio at South Church Hall in St. Johnsbury. Pianist Konrad Skolarski, violinist Jarosław Nadrzycki and cellist Karol Marianowski combine their talents to present a richly varied program ranging from the Romantic period to 20th-century Polish modernism. Luminous works played with refinement and depth include a piano trio by little-known composer — and compatriot of the group — Grzegorz Fitelberg, as well as evergreen masterpieces by Joseph Haydn and Claude Debussy.