On the off chance that "Last Leviathan" is not the song you are looking for, here is a possible alternative.

THE SONG OF THE WORLD'S LAST WHALE (1970, Pete Seeger)

I heard the song
Of the world's last whale,
As I rocked in the moonlight
And reefed the wail.
It'll happen to you
Also without fail,
If it happens to me
Sang the world's last whale.

It was down off Bermuda
Early last spring,
Near and underwater mountain
Where the humpbacks sing.
I lowered the microphone
A quarter mile down,
Switched on the recorder
And let the tape spin round.

I didn't just hear grunting,
I didn't just hear squeaks,
I didn't just hear bellows,
I didn't just hear shrieks.
It was the musical singing
And the passionate wail
That came from the heart
Of the world's last whale.

Down in the Antarctic
The harpoons wait,
But it's up on the land
They decide my fate.
In London Town
They'll be telling the tale,
If it's life or death
For the world's last whale.

So here' s little test
Tosee how you feel,
Here's a little test
For the Age Of The Automobile.
If we can save
Our singers in the sea,
Perhaps there's a chance
To save you and me.

I heard the song
Of the world's last whale,
As I rocked in the moonlight
And reefed the wail.
It'll happen to you
Also without fail,
If it happens to me
Sang the world's last whale.

rich r^^