Avocal style somewhere between speech and song, meant to deliver plot points and dialogue, is known as

The answer is: Recitative

Recitative is most commonly seen in artistic performance such as opera.  The lyrics of the songs that contained in the recitative most often become a part of dialogue between the characters. Listening to the songs under that situation is the only way for the audiences to follow the story forward.

answer; early greeks were econimically stagnant and cut off from other near eastern civilizations;

answer; 35 year old african american man who is also a college graduate;