The Czech Republic chamber music ensemble the Prazak Quartet will perform at 7:30 p.m. Tuesday in the Martha-Ellen Recital Hall at Music Hall. The group will perform pieces by Franz Xaver Richter and Bedrich Smetana. The quartet will conduct a class at 1 p.m. with the two ISU chamber ensembles that all are welcomed to attend. Tickets are $25 and available at Rieman Music, 409 Douglas Ave., the ISU music department office, www.amestownandgown.org and at the door. It’s free for those in grades K-12 and college students.