Four of Johann Sebastian Bach’s greatest orchestral works will all be performed in this all-Bach program of concerti performed on period instruments with soloists harpsichordist Jonathan Oddie, violinist Carrie Krause and baroque flutist Jeffrey Cohan along with string chamber orchestra in “Concerti by Bach,” presented by the Salish Sea Early Music Festival on Saturday, May 25, at 7 p.m. at the Orcas Adventist Fellowship Church. Other members of the chamber orchestra include baroque violinists Elizabeth Phelps and Courtney Kuroda, baroque violist Stephen Creswell and baroque cellist Caroline Nicolas. Admission is by donation.