The Odeion of Ancient Ephesus was financed by a wealthy citizen named Vedius Antonius. It has a semi-circular shape, just like a small theatre. It had gradines divided into diazomas and two corridors on each side let people access the higher seats. There was also an orchestra and a podium.
There were five entrances to the podium (in the front side of the theatre and along the street to the State Agora. The Odeon was adorned with pillars and it must have had a wooden roof in the past.
The Odeion was used for political meetings (bouleuterion), social events, concerts and theatrical performances.