1. By the rivers of Babylon, there we sat and wept as we remembered Zion.
2. There, upon the willows, we hung our harps.
3. For there our captors demanded of us songs, and those who scorned us-rejoicing, [saying,] "Sing to us of the songs of Zion.”
4. How can we sing the song of the Lord on alien soil?
5. If I forget you, Jerusalem, let my right hand forget [its dexterity].

Tehillim Ohel Yoseph Yitzchok (Kehot Publication Society)

Tehillim is recited by Jewish people collectively and individually, as the desire occurs to offer praise and thanksgiving to G-d; or alternitavely, in times of crisis and need, as a form of supplication, and even as a venue to express regret for sin.

6. Let my tongue cleave to my palate if I will not remember you, if I will not bring to mind Jerusalem during my greatest joy!
7. Remember, O Lord, against the Edomites the day of [the destruction of] Jerusalem, when they said, "Raze it, raze it to its very foundation!”
8. O Babylon, who is destined to be laid waste, happy is he who will repay you in retribution for what you have inflicted on us.
9. Happy is he who will seize and crush your infants against the rock!