This narrative point of view is the third-person omniscient narration.
The third-person omniscient narrator is the one that knows all the thoughts and feelings of all of the characters. It generally offers the most objective point of view in story and does not suggest any kind of preferences about the characters since it possesses full knowledge of them.
B) established a rhythm and required cooperation. All of the other answer choices don't really fit like this because why else would those songs help them?