The Caribou Choral Society will begin rehearsals for its 40th Anniversary Christmas concerts on Tuesday, Sept. 27, 7 p.m. at the Mormon Church Recreation Room, Paris Snow Drive in Caribou. All area singers interested in singing advanced four-part music are encouraged to join at that time, especially former Choral Society members. The concerts, entitled 40 Years of Favorites, will be held in Madawaska on Dec. 4, Presque Isle on Dec. 9, and Caribou on Dec. 10. FMI, contact Dan Ladner, conductor, at 764-1482 or David Wilson, president, at 455-8374.