John Gill Commentary 2 Samuel 1:17

"And David lamented with this lamentation over Saul and over Jonathan his son" — 2 Samuel 1:17 (ASV)

And David lamented with this lamentation over Saul, and over
Jonathan his son .
] Composed the following elegy on account of their death, and sung it in a tune agreeable to it, he and the men that were with him.