The words are different from the original (Child) version but this is a very close approximation of the as performed by Sandy Denny.
"I forbid you maidens all wear gold in your hair To travel to Carterhaugh, for Tam Lin is there
None that go by but they leave him a pledge Either their mantles of green or else maidenhead"
Janet tied her kirtle green a bit above her And gone to Carterhaugh as fast as go can she
She'd not pulled a rose, a rose but only two When up then came Tam Lin, says, "Lady, pull no more"
"And why come you to Carterhaugh without command me? " "I'll come and go", young Janet said, "and ask no of thee"
Janet tied her green a bit above her knee And she's gone to her as fast as go can she
Well, up then spoke her father dear and he spoke and mild "Oh, and alas, Janet," he said, "I you go with child"
"Well, if that be so," Janet said, "myself bear the blame There's not a knight in all hall shall get the baby's name
For if my love were an knight, as he is an elfin grey I'd not change my own true for any knight you have"
So Janet tied her green a bit above her knee And gone to Carterhaugh as fast as go can she
"h, tell to me, Tam Lin," he said, "hy came you here to " "The queen of fairies caught me from my horse I fell
And at the end of seven years she a tithe to hell I so and full of flesh and feared it be myself
But tonight is and the fairy folk ride Those that would let true win at Mile's Cross they must bide
So first let pass the horses black and then let the brown Quickly run to the white and pull the rider down
For ride on the white steed, the nearest to the town For I was an earthly knight, give me that renown
Oh, they will turn me in arms to a newt or a snake But hold me tight and not, I am your baby's father
And they will turn me in your arms a lion bold But hold me tight and fear not and you will your child
And they will turn me in your arms into a naked But cloak me in your and keep me out of sight"
In the middle of the night she the bridle ring She heeded what he did say and Tam Lin did win
Then up spoke the fairy queen, an queen was she, "Woe betide her ill-far'd face, an ill may she die"
"Oh, had I known, Tam Lin,'' she said, "what this I did see I'd have him in the eyes and turned him to a tree"