The exceptional chamber group the Four Nations Ensemble once again pays its seasonal visit to our area with an exclusive, intimate performance at the home of Dennis Wedlick and Curtis DeVito on September 21. Headed by harpsichordist Andrew Appel, Four Nations is further composed of cellist Loretta O'Sullivan, and violinist Tatiana Chulochnikova, and has asked several outside musicians to join the ensemble for its in Hudson Valley concerts. This appearance features guests soprano Rosa Lamoreaux, flutist Colin St. Martin, and viola da gamba master Joshua Lee in a program of sonatas and arias of Buxtehude, Bach, Telemann. 3:30pm. $100. Kinderhook. (212) 928-5708; Fournations.org.