Parallel
Psalms 136:3
Brenton's English Septuagint · Berean Standard Bible
For there they that had taken us captive asked of us the words of a song; and they that had carried us away [asked] a hymn, [saying], Sing us [one] of the songs of Sion.
137:3
for there our captors requested a song; our tormentors demanded songs of joy: “Sing us a song of Zion.”