“By the rivers of Babylon, there we sat down.
Yea, we wept when we remembered Zion.
For 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!’ ”
Psalm 137:1, 3
The wicked who take God’s people captive love their holy, joyous singing, and want to hear it. The singing of the children of God reminds demons of the music they once heard in heaven before they were forever cast out.