The Dark is Rising, by Susan Cooper
When the Dark comes rising, six shall turn it back;
Three from the circle, three from the track;
Wood, bronze, iron; water, fire, stone;
Five will return, and one go alone.
Iron for the birthday, bronze carried long;
Wood from the burning, stone out of song;
Fire in the candle-ring, water from the thaw;
Six Signs the circle, and the grail gone before.