Principal parts of a Greek tragedy

Principal parts of a Greek tragedy:

                                        A Greek tragedy normally contained the following parts:

1. The prologue the part before the entrance of chorus, in monologue or dialogue setting forth the subject of the drama and the situation from which it starts. In the earliest tragedies the play begins with the entrance of the chorus, who set forth the subject.

2. The song accompanying the entrance of the chorus.

3. The episodes, scenes in which one or more actors took part, with the chorus.

4. These songs were originally reflections or expressions of emotion evoked by the preceding episode.