Sunday-Monday: Accordo, now in its fourth season, is composed of leading players from the Twin Cities’ two major orchestras. For their next program, “In the Footsteps of Bach,” the musicians have added a performance at Stillwater’s Trinity Lutheran Church (a longtime St. Paul Chamber Orchestra venue). On the bill are string works by three Bach-inspired contrapuntists: a trio (Mozart’s K.404a), a quartet (Hindemith’s Op. 22) and a sextet (Brahms’ gorgeous Op. 18). (4 p.m. Sun., Trinity Lutheran Church, 115 4th St. N., Stillwater, $25, 1-888-800-8343 or; 7:30 Mon., Christ Church Lutheran, 3244 34th Av. S., Mpls., $12-$24, 651-292-3268 or