Saturday-next Sunday: Three 20th-century rarities and a staple, all led by Scottish-born composer/conductor Oliver Knussen, fill next weekend's St. Paul Chamber Orchestra program. Knussen's own "Scriabin Settings," Frank Bridge's "There Is a Willow Grows Aslant a Brook" (its title from "Hamlet") and Schoenberg's path-breaking "Accompaniment to a Film Scene" serve as prelude to Alban Berg's rigorous yet seductive Chamber Concerto, written for Schoenberg's 50th birthday; violinist Leila Josefowicz and pianist Kirill Gerstein are the soloists. (8 p.m. Sat. Ordway Center, 5th and Washington Sts., St. Paul; 2 p.m. next Sun., Benson Great Hall, Bethel University, 3900 Bethel Dr., Arden Hills. $10-$40. 651-291-1144 or