There's an article about the song at calypsoworld.org. The title they use is EDWARD VIII, although the title on the original 1937 record label was EDWARD THE VIII. The original writer/performer was Rufus Callender, known as Caresser or Lord Caresser, from Trinidad, although many others also recorded it. Harry Belafonte recorded it under the title LOVE, LOVE ALONE and Taj Mahal recorded it under the title KING EDWARD'S THRONE.

That site also has complete lyrics and a sound file of a performance by the Duke of Iron, Lord Invader and Macbeth the Great accompanied by Gerald Clark and His Invaders, recorded at Town Hall, New York, 1946.

EDWARD VIII
Rufus Callender (Lord Caresser), 1937

Now, it's love, love alone
That cause King Edward to leave his throne.

CHORUS: It's love, love alone
That cause King Edward to leave his throne.

Yes, we know Edward is noble and great,
But love will cause him to abdicate.

Oh, what a sad disappointment
Was endured by the British government.

On the tenth of December, we heard the talk
That he gave the throne to the Duke of York.

He said, "I'm sorry my mother is going to grieve,
But I cannot help. I'm bound to leave.

"Yes, we got the money. We got the talk
And the fancy walk just to suit New York.

"And if I can't get a boat to set me free,
Well, I will walk to Miss Simpson across the sea.

"Scepter, robes and my crown is on my mind,
But I cannot leave Miss Simpson behind."

And if you see Miss Simpson walk in the street,
She can fall an angel with her body beat.

Oh, how Baldwin tried to break down his plan.
He said, "Come what may the American."

"Yea, they can take my crown, they can take my throne,
But they must leave Miss Simpson and me alone."

Oh, let the organ roll, let the church bell ring.
Good luck to our second bachelor king!

Though he is gone, don't give him bad name,
For you and I might have done the same.

Aspersion on Simpson they try to cast.
They even say that she had a shady past.

Now on the annals of history
He has left a record for intensity.