Seven Standing Stones

I've been looking through old school exercise books. This is from June 1986; I was eleven.

Seven standing stones are under the sky,
seven standing stones shall never, ever die.
Clouds blow, grey, white, or black,
and the wind shall blow, blow through the stones,
and memories shall fade and die,
and nobody shall know, know the reason why
seven standing stones are under the sky.
Seven standing stones--
years shall pass, and grass will grow,
around the stones, and groans of lonely stones
who know why--
they know why who toiled to erect them under the sky,
and the wind shall whistle through the trees,
and the wind shall whistle through the trees.