LEWISTON, Maine — The Bates College Choir and Orchestra, conducted by Choir Director John Corrie, will perform music by Mozart, Vivaldi and Bach at 8 p.m. Friday, Dec. 1, and Saturday, Dec. 2, in the Olin Arts Center Concert Hall on Russell Street. All soloists for the performances are members of the college choir. The chamber orchestra is made up of members of the Bates College Orchestra. The public is invited to attend these concerts free of charge. Additional information is available by calling the Olin Arts Center at 207-786-6315.