Mythological narratives

The elements of ancient Greek Theatre
Take one fundamental element that is found in ancient Greek drama (for example; the mask, sacrifice, oral poetry, dance, choral performance, procession, ritual, cult practice, politics, gender conflict, mythological
narratives, staging, etc.). Describe this element and relate it to Aeschylus’ Oresteia (Agamemnon, Libation
Bearers, Furies).