Conversation so far:
What plays was Anna Vissi in?
In November 1991, Vissi and Karvelas starred in the first Greek rock opera, Daimones (Demons)
When did Anna Vissi start doing television?
At the age of twelve she entered a talent competition. Two years later, she was the main singer at Ayia Tilliria, which was also her first TV appearance.

Question: What is Daimones?
Self-contained rewrite: What is the opera Daimones?