Charles Ellicott Commentary Jeremiah 48:36

"Therefore my heart soundeth for Moab like pipes, and my heart soundeth like pipes for the men of Kir-heres: therefore the abundance that he hath gotten is perished." — Jeremiah 48:36 (ASV)

Mine heart shall sound for Moab like pipes ... —The words reproduce Isaiah 16:11. His heart becomes, as it were, musical in its groans and sighs. He cannot look on the panic-stricken and mourning city without sharing in its misery.

In the baldness (Jeremiah 7:29; Jeremiah 16:6), the clipped beard, the cuttings (Jeremiah 16:6; Jeremiah 41:5), the sackcloth (Jeremiah 4:8; Jeremiah 6:26; Joel 1:8) we have the customary signs of mourning for the dead. The “pipe” is chosen rather than the harp, as in Isaiah 16:11, because it had come to be the recognized music for funerals .