Music in a Great Space Concert Series presents Ken Medema, singer, songwriter and pianist, at 4 p.m. Sunday at Shadyside Presbyterian Church, 5121 Westminster Place. Tickets are $10 for adults and $5 for senior citizens age 60 and older; students and children are admitted free. Call 412-682-4300 or visit www.shadysidepres.org.

Pittsburgh Opera presents "Falstaf," Giuseppe Verdi's final masterpiece, at 8 p.m. Saturday, at 7 p.m. Tuesday, at 8 p.m. Oct. 30 and at 2 p.m. Nov. 1 at the Benedum Center, 719 Liberty Ave. The opera will be sung in Italian with English texts projected above the stage. Tickets start at $10. Call 412-456-6666 or visit www.pittsburghopera.org.