Here's the Niles recording I'm most familiar with:

https://www.youtube.com/watch?v=luIxKOKp-dc

Here's another recording by Niles:

https://www.youtube.com/watch?v=DtGvUAiGcxk

And here's my transcription.

BLACK IS THE COLOR OF MY TRUE LOVE'S HAIR
(as sung by John Jacob Niles)

Black, black, black is the color of my true love’s hair,
Her lips are something rosy fair.
The prettiest face and the daintiest hands,
I love the grass whereon she stands.

I love my love, and well she knows,
I love the grass whereon she goes.
If she on earth no more I see,
My life will quickly leave me.

I go to troublesome to mourn, to weep,
But satisfied, I ne’er shall (could?) sleep.
I’ll write her a note in a few little lines,
And suffer death ten thousand times.

Black, black black is the color of my true love’s hair,
Her lips are something rosy fair.
The prettiest face and the daintiest hands,
I love the grass whereon she stands.

I think a lot of people use the Niles melody, but leave out the annoying [IMHO] "black, black, black" affectation.

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Here's a recording of Jo Stafford singing the Niles version exactly as I'd sing it - without the first measure (i.e., with only one "black.") This recording may not play outside the U.S.:

https://www.youtube.com/watch?v=53yKrLWr798