The origins of Greek drama began with ancient hymns called dithyrambs that were sung in honor of Dionysus. These hymns evolved into choral processions where participants wore costumes and masks. Early Greek theaters were simple outdoor spaces where audiences watched and listened to choruses perform about gods and heroes. The key parts of the theater included the orchestra where the chorus performed, the theatron where spectators sat, and the skene which represented a building and had doors for entrances and exits. The first plays were staged in the Theater of Dionysus in Athens in the 5th century BC.