Here is a song by the German group Birth Control called "The Work Is Done".

It's a typical anti Vietnam war song, but at 2m11s in there is a piano piece
whch I am convinced was the callsign of a radio station.

http://www.swldxer.co.uk/theworkisdone.wma

Can anyone confirm which callsign it was?

The Work Is Done, The Work Is Done
The Work Is Done I Have Just Killed A Child
You Know Down In Vietnam
It Needs No Father, It Needs No Mother
It Needs No Parents Anymore, Cause You Know,
Cause You Know The Work Is Done

So Gimme Shelter, So Gimme Shelter
So Gimme Shelter Uncle Sam, I'm A Lonely Boy
I Have Just Killed Someone
So Gimme Shelter Uncle Sam, I'm A Lonely Boy
I Have Just Killed Someone

I Love The Peace, I Love The Peace
I Love The Peace And If I Killed The Enemy They Said
I Have Done Nothing Wrong
Do Me A Favour, Do Me A Favour
Do Me A Favour Just Believe That I Feel What I Say
Life Is Hard Enough

So Gimme Shelter, So Gimme Shelter
So Gimme Shelter Uncle Sam, I'm A Lonely Boy
I Have Just Killed Someone
So Gimme Shelter Uncle Sam, I'm A Lonely Boy
I Have Just Killed Someone

PIANO CALLSIGN?

So Gimme Shelter, So Gimme Shelter
So Uncle Sam Look What I Have Done
I'm On My Way
I'm Going Home

--
Simon Mason
http://www.simonmason.karoo.net