No, no, No, NO!! That's not the one I was talking about! Besides, I'm sure that one doesn't go to the tune of Unicorns. The one I'm talking about goes something like this:

(first verse, unknown)
...And the loveliest of theories would be unified.

(basic chorus)
We studied quantum mechanics, studied QED,
Our special and our general relativity.
(next line unknown)
...But the loveliest of theories would be unified.

Now Einstein was a genius, of that there's no doubt.
There never was much physics that he couldn't figure out.
But there was still one problem that always taxed his brain.
And as the years went by he was heard to complain:

"I've got my quantum mechanics, got my QED,
My special and my general relativity.
I've a cat, but that's irrelevent. I've tried and I've tried,
But my field theories just aren't unified."

Well, Einstein passed on. He came before the Lord.
The Lord said, "Albert you deserve a reward.
Make any one request, and I'll be happy to yield."
He said, "Lord, I'd like the theory of the unified field:

I've studied quantum mechanics, studied QED,
My special and my general relativity.
But I worked upon this problem 'till the day that I died,
And my field theories just weren't unified."

The lord said, "Albert, you're a really great man,
But not even you can fathom my vast eternal plan."
He plucked a sheaf of papers right out of thin air,
Handed them to Einstein and said, "It's all there:

You've got your quantum mechanics, got your QED,
Your special and your general relativity.
Mass and time and energy and gravity tied
Together in a theory that is unified."

Einstein took the papers with a trembling hand.
He looked at them in ecstasy, the theories were so grand.
Then he peered at one equation...flipped back to page 10...
Sadly shook his head and said, "Wrong again.

I've got my quantum mechanics, got my QED,
My special and my general relativity.
But as for field theories, in peace I'll abide,
'Cause the Lord Himself can't make one unified."

So study quantum mechanics, study QED,
Your special and your general relativity.
But you might as well go hunting just as sure as you're born,
For a unified field theory...or a unicorn.