While Roving On A Winter's Night is a duet with Dar Williams and can be found on the album Heritage from Six Degrees Records, here's a link:

http://www.sixdegreesrecords.com/artists/heritage/

Don't know much about the song, seems to be an old traditional piece, Doc Watson's name came up on some searches I did.  Wherever it comes from, I like it, John and Dar's voices compliment each other well. 

Listen to While Roving On A Winter's Night

While Roving on A Winter's Night

While roving on a winters night
And drinking good old wine.
Thinking about that dear little girl
She broke this heart of mine.

For she is like a budded rose
That blooms in the month of June.
She's like some music instrument
That's just been played in tune.

Oh who's gonna shoe your poor little foot
And who will glove your hand
Who will kiss your red ruby lips
And who's gonna be your man

Well Papa will shoe my poor little foot
And Mama will glove my hand
You can kiss my red ruby lips
And you can be my man

Perhaps a trip to far off lands
A trip to France or Spain
But if I go ten thousand miles,
I'm coming back again

I'm roving on a winter's night
And drinking good old wine
Thinking about that dear little girl
She broke this heart of mine.