Sheepscot Valley Chorus will hold its first rehearsal of the new season at 7 p.m. on Tuesday, January 14, at Wiscasset Congregational Church on Route 1. New singers are encouraged to join; they may call director Linda Blanchard at 380-2768 or simply come to the first rehearsal. The chorus will perform Paul Winter’s “Missa Gaia (Earth Mass): A Mass in Celebration of Mother Earth,” dedicated to St. Francis, the patron saint of ecology, in April. The piece will feature a children’s choir, African percussion, bass, cello, guitar, organ, piano and soprano sax, along with animal calls.