The Theatre of Ancient Greece

Following on from 'The open door' album cover, the lighting in the image i feel is really important. There's always been this superstition about the light and dark in theatre, which arrives from the very start of the theatre in ancient Greece. It was known that if you were on stage right you were righteous, on the side of the good. If you were on the stage left then you were in the wrong, side of the bad.
The Greeks always believed in the Gods such as Zeus and Hades and that there was always this battle between good and evil, which were always depicted in the Greek theatre.
There are four qualities of Greek Drama;
1- Performed for special occasions (to worship Dionysus)
2- Competitive (Actors and playwrights competed)
3- Choral (singing was an important part
4- Closely associated with religion (stories based on myth or history)

I found it quite difficult looking for the right answers and back up evidence for the meanings of lighting in the theatre so i interviewed a fellow art student who before hand was studying in the performing arts named Gareth Wild.