Odeon was used by members of the City Council, wealthy and executive people of Ephesus and Curetes gathered for governmental discussions about future of city and also listened to musical concerts. The expenses of the structure were supported by P. Vedius Antonius and his wife Flavia Papiana, who were among the wealthy inhabitants of city.
It was used as a Bouleuterion which was for the meetings of the Boulea or the Senate. Boulea had religious, executive, political and judicial power. In Ephesus the two councils which were Demos or the Parliament. Demos or Parliment was open to the public and was taken place in the Grand Theatre and the Bouleia which was for their meetings in Bouleuterion. The members of the Boulea were the high class of the city. Ephesus was administered by senate who was selected by the main council. The important decisions about building; temple, theatres, baths, the collection of taxes were the most common topics of the city matters.
The is semicircle form and there are three main sections; cavea, orchestra and stage building. The capacity of the structure is about 1500 spectators with three doors opening from the stage to the podium.