The Rock at Knoch Battle of the Bands is set for 5:30 to 11:30 p.m. March 30 in the Knoch High School auditorium. Bands scheduled to perform are: The Followers, Unknown, Shift Change, Mosquito Pomegranate, Mighty, Oceans of Glass, Janet's Pet Planet, Back to The Good Stuff and the Semi-Supervillains. The winning band will be chosen by attendees who purchase voting tickets. Proceeds go to the Knoch choral program. Call 724-352-2446 or 724-841-6231.

<B>Chamber Music with the Harp </B>will take place at 7:30 p.m. Saturday at Westminster Presbyterian Church, 2040 Washington Road, in Mount Lebanon. Featured will be harpist Gretchen Van Hoesen. Admission is free. Call 412-835-6630.<B>Pittsburgh Opera</B> presents “Tosca” by Giacomo Puccini at 8 p.m. Saturday and March 30, 7 p.m. Tuesday and 2 p.m. April 1 at the Benedum Center, 719 Liberty Ave. Call 412-281-0912, Ext. 225, or visit the website www.pittsburghopera.org.