1By the rivers of Babylon, there we sat down, yea, we wept, when we remembered Zion.
2We hanged our harps upon the willows in the midst thereof.
3For there they that carried us away captive required of us a song; and they that wasted us required of us mirth, saying, Sing us one of the songs of Zion.
4How shall we sing the LORD's song in a strange land?
5If I forget thee, O Jerusalem, let my right hand forget her cunning.
6If I do not remember thee, let my tongue cleave to the roof of my mouth; if I prefer not Jerusalem above my chief joy.
7Remember, O LORD, the children of Edom in the day of Jerusalem; who said, Rase it, rase it, even to the foundation thereof.
8O daughter of Babylon, who art to be destroyed; happy shall he be, that rewardeth thee as thou hast served us.
9Happy shall he be, that taketh and dasheth thy little ones against the stones
(King James translation. The best).
The first passages have become cultural icons; the last two are rarely recited - and it's better so.
Here's a modern shir forged from the 5-6th verses, performed by Yaacov Shweiki
Here's another version, being applied to a very profane context: a victorious Beitar Yerusahlayim, our magnificent hometown team. But that's part of the point, isn't it: Beitar's fans sing a psalm to celebrate their team. I'll bet Manchester United fans can't do that.
Then, in this one film, we've got the opposite application. From time immemorial Jews have crowned perhaps their greatest celebration, the wedding, with an act of mourning for the destroyed city of Jerusalem, by breaking a glass. The counterpart is that they console the bereaved with the wish that they'll find consolation in the rebuilding of Jerusalem. Here you can see a fellow singing the psalm at his own wedding, just before he breaks the glass.