Free holiday concert! The all-volunteer, 60-voice Chorus of Dorchester will perform its 48th series of wonderful seasonal music. Since 1975 the Chorus of Dorchester has been bringing together Dorchester County residents and friends from middle schoolers to senior citizens who share a love of singing. Its membership includes many who have participated since 1975 as well as a number who have joined for the first time this year. The Chorus is under the direction of Cookie Brohawn, accompanied by Laura Todd on piano and Barbara Hubbard on organ, and funded by the Nathan Foundation.