Pittsburgh Civic Light Opera is a nonprofit professional theater company based in the Cultural District of Downtown Pittsburgh, Pennsylvania, USA. Pittsburgh CLO stages productions of musical theater classics, drawing more than 200,000 patrons each year; its annual budget is nearly $10 million.Established on 20 February 1946, it premiered at Pitt Stadium on 3 June 1946, where it offered outdoor performances until 1958. In 1961, the Civic Arena, was built to house the CLO.