Works by Renaissance composer Jacob Gallus, American composer Morten Lauridson and French composer Pierre Villette, among others, will be sung in various languages by Southern Oregon University’s Concert Choir, directed by Fredna Grimland, and Chamber Choir, directed by Paul French. The holiday show, titled “O Magnum Mysterium,” will be presented at 3 p.m. Sunday, Dec. 4, in the Music Recital Hall on the SOU campus, 1250 Siskiyou Blvd. Admission is $5, free for students. Advance tickets may be purchased by calling 541-552-6101.