Here's the rest of the song, or at least those lyrics I'm reasonably certain of:

Oh the ..... ..... pass willows sighing
Forcing bluestone ..... ..... ..... free
Harsh winds turn you, silver lightning
Running homeward, running homeward to the sea

Hawthorn tangle under ragged sky
Rush wind beating ..... ..... ..... tree
Paling moon casts winter's slivers
Over darkened fields to fell and spring

All things equal, purpose guided
Plant and creature ..... ..... ..... birth
Each dependent to the other
To fire and water, air and earth

Spun from the wheel of all creation
Standing naked, eyes to the sky
Comes builder and thinker
Learner, destroyer, I sometimes wonder which am I, which am I, which am I


I've fed all the unique phrases into Google and found nothing :-(