The symphonic outdoor drama is a kind of historical play, set outdoors on the very site depicted in account. It combines music, dance, and drama in a unique way to tell the story. It is most like historical pageantry performed in Europe in the Middle Ages. The best known example of a religious pageant in this style is at Oberammergau, Germany. Many big, spectacular stage events became popular in the United States in the late 19th and early 20th centuries. These pageants were not exactly plays, but they showed a series of scenes in which historical events followed one another.
The University of North Carolina Press Article on The Lost Colony: A Symphonic Drama of American History’.