How is the Chorus important to the Greek Drama?
Initially, dialogue developed when the stage singer broke ranks and began interacting with the chorus. At heart, tho, the chrous gives the thoughts and feelings of the principals on stage. (I don’t know why this line isn’t word-wrapping.) As play writing developed, the chorus began warning characters (which warnings the audience heard but the characters didn’t, and appeared to ignore . . . to their certain doom.) In other words, the chorus became a character in its own right. One thing you could have fun with is to take this, select a modern movie, and identify which character in the movie is the “chorus.” In “Finding Nemo,” it’d the the school of fish (John Ratzenberger); in “Stranger than Fiction,” it’d the professor (Dustin Hoffman.) Go wild.