Final answer:
The 3rd choral ode's subject can vary depending on the specific work and often reflects on themes pivotal to the drama, combining elements of human achievement, memory, and emotion, integral to the action as in the tradition of Greek theatre.
Step-by-step explanation:
The third choral ode often signifies a pivotal moment in Greek tragedies. In the context of the provided excerpts, it seems the ode might be exploring themes such as the wonder of human achievement against nature's permanence, or perhaps the impact of memory and emotion elicited by music or imagery. However, without a specific work to reference, it's challenging to pinpoint what the third choral ode is about. Choral odes can vary widely in their themes, from the motets of Cyprien de Rore with their focus on the musical interval of the third, the serene yet profound reflections in Ode on a Grecian Urn, or the communal and emotional impact of the Ode to Joy in challenging times as seen in Odessa.
In the context of Ancient Greek theatre, as per Sophocles' approach mentioned, the choral odes are meant to be integral to the action, contributing to the thematic depth and emotional resonance of the play. Therefore, the subject of the 3rd choral ode would likely mirror this intention, serving as a commentary or reflection pertinent to the events and characters of the drama.