Matthew Poole and continuators on Psalms 137:2

2 We hanged our harps upon the willows , in the midst thereof.

These are not without great probability supposed to be the words of some holy Levites, who had been accustomed to musick, both vocal and instrumental, in the service of the Temple. Harps are here put by a Synecdoche for all instruments of musick. It is further to be observed, That although the harp was used by the Grecians in mourning, yet it was used by the Hebrews in re[illegible: 1+ letters]oycing, as is manifest from Gen. 31. 27. 2 Chron. 20. 27, 28. Psal. 43. 4, &c. This passage is to be understood either, 1. figuratively, signifying onely that they abandoned all signs and means of comfort: or rather, 2. properly, as the following songs are, which the Babylonians required them to sing to their harps▪ And these harps they might either, 1. bring from Ierusalem, which they might desire to do to preserve those sacred utensils, and their enemies might either permit or command them to do for their own delight: or, 2. procure in Babylon, that they might sometimes solace themselves with the practice of some of the Temple-musick, which they desired and intended to do; but when they came to the tryal, they were not able to do it, and therefore laid them by.

Which commonly grow upon the banks of rivers, as they did by Euphrates in such plenty, that from thence it is called the brook of willows, Isa. 15. 7.