Hope this might be the one you're thinking about - one of the most beautiful and haunting songs written in recent times. Happy singing!

I Dreamed There Were Unicorns
Bill Caddick

We were travelling north to sing and play
For friends that we had never met.
Been working hard and didn't speak
The sky was grey and threatened wet.
And I dreamed that I saw unicorns,
Dreamed I saw them wild and white.
Their sudden beauty lit the world
Like a star will light a winter's night.

Pure as love with manes of milk
They danced and pranced and cried aloud,
Bright as rainbows around the stars,
Their eyes were soft and sad and proud.

And I wept for the wild and dirty world
To which this beauty now was lost.
And cursed the hungry mind of man
That feeds the future at such cost.
My head was bowed, my eyes were closed,
When in my ears their voices rang,
And these few words lodged deep inside
And in my very soul they sang ....

"We never went away,
You always knew that we were near.
Remember how to look for us,
You'll see we were always here."

I raised my eyes to seek them out,
The world was empty all around.
The rain came tumbling from the sky.
It drowned all dreams upon the ground.
And when they asked me why I wept,
Like one who for his dead love mourns,
The only answer I could give -
I dreamed that there were unicorns.

"We never went away,
You always knew that we were near.
Remember how to look for us,
You'll see we were always here."^^^