When Nebuchadnezzar led Israel into the Babylonian captivity, he demanded that the Levites — the Temple singers — perform the Songs of Zion for his court. The Levites had spent their lives rehearsing the music of the Temple. Their fingers knew the harpstrings the way other hands know their own palms.
In answer to the king's command, they took down their harps and hung them on the willow trees that lined the riverbank. Scripture remembers the moment in a single piercing line (Psalm 137:2): Upon the willows in her midst had we hung up our harps.
Then the Levites spoke, half to their captors and half to themselves. "If we had only performed the will of God with full devotion, and sung His praises in truth, we would not have been delivered into your hands. And now, how can we sing before you the prayers and hymns that belong only to the One Eternal God?"
They quoted the psalm itself as their final answer (Psalm 137:4): How shall we sing the song of the Lord on the soil of the stranger? The midrash preserves this scene as the definition of exile. Exile is not just geography. It is the moment when the holiest music you know becomes impossible to sing — when the instrument in your hand belongs to a Temple that no longer stands, and the only honest offering left is silence.