[Polak]

If I would have to choose I would choose Warszawianka (Варшавянка) since it's Polish Originaly it's not a socialist hymn but a great Polish battlehymn first written in french.
http://www.chambre-claire.com/PAROLE...arsovienne.htm(French version)

English translation*
Today is a day of blood and glory,
That it be a day of resurrection!
Gazing at France’s star,
The White Eagle launches into flight.
And it, inspired by hope,
Calls to us from on high,
"Arise, oh Poland, break your chains,
Today is a day of victory or death!"
Hey, whoever is a Pole, to your bayonettes!
Live, freedom, oh Poland, live!
Let this worthy battle cry:
Sound forth to our foes!
Sound forth to our foes!
Oh Frenchmen! Are our wounds
Of no value for you?
At Marengo, Wagram, Jena,
Dresden, Leipzig, and Waterloo
The world betrayed you, but we stood firm.
In death or victory, we stand by you!
Oh brothers, we gave blood for you.
Today you give us nothing but tears.
Hey, whoever is a Pole, to your bayonettes!
Live, freedom, oh Poland, live!
Let this worthy battle cry:
Sound forth to our foes!
Sound forth to our foes!

*Non-socialist version
Those where the days, when honor, value and manhood really ment something...