How does the choir bring tension to Chapter 1?

The first sign of disturbance on the seemingly tranquil island is the appearance of Jack and his choir. Golding describes Jack and his compatriots as militaristic and aggressive, with Jack's bold manner and the choir marching in step. They are the first concrete example of civilization on the island, with a decidedly negative feel. Jack seems a physical manifestation of evil; with his dark cloak and wild red hair, his appearance is ominous, even Satanic. Accordingly, Jack is militaristic and authoritarian. He gives orders to his choir as if they were troops, allowing room for neither discussion nor dissent. Significantly, the role that he first chooses for his choir is that of hunters-he selects that task which is most violent and most related to military values.