Denver symphony orchestra Musicians file unfair labor practices against Denver Symphony Association. RMN S 22, 1973 p.10 Trying to find a hall for a free concert; union negotiations stalemated. RMN S 27, 1973 p.6 Demands of pay increase by musicians considered excessive. Post 0 1, 1973 p.2 Ended strike 0 5, 1973 and have returned to work. RMN 0 6, 1973 p.8 Opens season after resolution of labor difficulties. Post 0 9, 1973 p.39