Music in a Great Space, the concert series at Shadyside Presbyterian Church, will present IonSound, the ensemble-in-residence at the University of Pittsburgh, playing contemporary chamber music, at 4 p.m. Sunday at Westminster church on the corner of Amberson Avenue and 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 the website, www.shadysidepres.org.

Renaissance and Baroque Society of Pittsburgh will host Stile Antico, a vocal ensemble, at 8 p.m. Saturday at Calvary Episcopal Church in Shadyside. Associated talks precede concerts and question-and-answer sessions with the artists follow. Single tickets range from $20 to $35; full-time students ID pay $10. Visit www.rbsp.org.