By the rivers of Babylon, there we sat down; yea, we wept when we remembered Zion.
We hanged our harps upon the willows in the midst thereof.
For there they that carried us away captive required of us a song; and they that made us wail [required] mirth, [saying,] Sing us [one] of the songs of Zion.
References for Psalms 137:3
How should we sing a song of Jehovah's upon a foreign soil?
If I forget thee, Jerusalem, let my right hand forget [its skill];
If I do not remember thee, let my tongue cleave to my palate: if I prefer not Jerusalem above my chief joy.