Thanks, Monique.    I could get the basic idea but without knowing some of these specific words & idioms (which are not that easy to find in dictionaries) it was hard to come up with a really good translation.

I had copied the mondegreen "argentier" in the French lyrics above.   The correct lyric is "Chez Bianco, l'Argentin."   


Here's what I've come up with, for now, putting your clarifications (and the changes you suggested in PM) together with what I had before:

THE OLD PIANO
Music: Claude Léveillée; Lyrics: Claude Léveillée / Henri Contet

 1960

(Spoken:)
A piano has died and that woman loved it
When she was young, when she would come and drown her sorrows*
(Sung:)
by rubbing up against the nostalgic piano.


How beautiful was that piano! - good piano,
the piano of good friends in their day,
at Bianco's, the Argentinian, around three o'clock in the morning,
When she drank her pint of forgetfulness.
And alone now, she thinks about the life of this old dead piano.

She sees, she hears the masses from its twenty years spilling out of a chord.
At the bar, when she drinks, she is truly recalling hands on the white ivory.
Bianco's hands, hands that give her the gift of a bit of the old times.
But in his jeans, a ghost in blue jeans,
a second one and then twenty who talk as friends
About an old-fashioned bistro, about an old-fashioned piano.
She cried: "Me, I know! I know!"

She's going tell the story that's locked up in the old dead piano,
And this is the adventure that beats time louder and stronger.

In the light of life, the hands of friends,
The eyes of tomorrow, life before us,
Love, and then everything;
And everything and nothing more.
They have all died in the middle of a chord.
They died in Ravel, in a funny rainbow.
A soldier has come in, a soldier has come in ...

(Spoken:)
A piano has died and she loved it when she was young,
when she would come and drown her sorrows
(Sung:)
by rubbing up against the nostalgic piano.

-----
*get her soul drunk with deep sadness