Get to Know Your THSO! We are proud to call ourselves Indiana's oldest professional symphony orchestra! The THSO held our first concert in 1926 under the direction of Will H. Bryant at the "new" Indiana Theatre. Now in our 96th year, the THSO is proud of our long and distinguished history here in Wabash Valley. To learn more about the THSO's history, visit thso.org and click About! #gettoknowyourthso #thso #terrehautesymphonyorchestra #terrehaute #wabashvalley #symphonyorchestra #downtownterrehaute