How is the choir's first appearance described in Lord of the Flies?chapter 1

When the choir first appears, they are in formation. Jack
is a drill sergeant. He will not allow them to fall out. When one of the choir members
actually does seem to almost faint, then, and only then, does Jack give them permission
to stand at ease.

Jack is high strung. He is controlling.
He dictates to his choir. He addresses them with formality. The first signs of his
aggressive behavior are shown by the way he commands the
choir.

[The
choir] was a party of boys, marching approximately in step in two parallel lines and
dressed in strangely eccentric
clothing.

No doubt, Jack has
his troops in order. They march in step along the beaches. Jack is domineering and
controlling of the choir from the beginning of the
novel:

The boy
who controlled them was dressed in the same way though his cap badge was
golden.

When the choir begins
to scatter, Jack "shouted at
them."

'Choir! Stand
still!'

To Jack's command,
the choir obeyed:

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Wearily obedient, the choir huddled into line and
stood there swaying in the sun. None the less, some began to protest
faintly.

When one boy
"flopped on his face on the sand...the line broke
up."

Jack's response is that "he's always throwing faint."
Clearly, the choir is obedient and afraid of Jack.

As the
choir is the last to appear after Ralph had sounded the conch shell, Ralph agrees that
they will remain under the leadership of Jack:

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The last boys to appear are the choirboys, led
by Jack Merridew. Once assembled, the boys decide they need a chief and elect Ralph.
Ralph decides that the choir will remain intact under the leadership of Jack, who says
they will be hunters.