Mary you are right that it is indeed by Neil Young and is called After the Goldrush.. the lyrics are as follows:-

Well I dreamed I saw the knights in armour come, saying something about a queen
There were peasants singing and drummers drumming and the archer split the tree
There was a fanfare blowin' to the sun, that was floating on the breeze
Look at Mother Nature on the run in the nineteen seventies.

I was lying in a burnout basement, with the full moon in my eyes
I was looking for a replacement, when the sun burst through the sky
There was a band playing in my head and I felt like getting high
Thinking about what a friend had said, I was hoping it was a lie.

Well I dreamed I saw the silver spaceship flying, in the yellow haze of the sun
There were children cryin' and banners flyin' all around the chosen one.
All in a dream, all in a dream, the loading had begun. Flying Mother Nature's silver seed to a new home in the sun
Flying Mother Nature's silver seed to a new home in the sun.

Cheers
Mick