Thank you, Kitty - I had found the Website, but not the page with the lyrics. Here are the lyrics from the Webber-Fentiman Website, which I think we can consider to be definitive (although my transcription was pretty darn close to this):

LADY OF AUTUMN
(Dave Webber)

1.
My lady of Autumn sing me your song,
Play me your tune, tell me I'm wrong,
Tell me you don't mean the things that you say,
Tell me that we'll find a way.

2.
Your eye clear as Winter, your touch fresh as spring,
Your way like the summer, free as birds on the wing,
But the seasons are changing, it's time you were gone,
But the colours of you will go on.

3.
The fields that were golden are changing to brown,
The leaves that were green tumble to the ground,
And the warm sun of Summer makes way for the snow,
I know it's time you must go

4.
For the light it is changing the sky's overcast,
Winter is here now, Autumn is past,
And deep in this dark world some warmth I must find,
Though it's Winter in the valley, It's still Autumn in my mind.

My lady of Autumn sing me your song,
Play me your tune, tell me I'm wrong,
Tell me you don't mean the things that you say,
Tell me that we'll find a way.