The 90 singers of this national choral training program offer choral classics including O Schone Nacht of Brahms, Turn the World Around by Harry Belafonte, Benjamin Britten’s Rejoice in the Lamb with Trinity organist Michael Kleinschmidt, and Make our Garden Grow from Leonard Bernstein’s Candide. Anton Armstrong of St. Olaf College directs the choir. Tickets $10. Now on sale to contributing Friends of the Oregon Bach Festival. Sale to broad public begins May 14. At Trinity Episcopal Cathedral, 147 Northwest 19th Avenue, Portland, 97209.