The Holy Bible, English Standard Version (ESV): Containing the Old and New Testaments. Wheaton: Crossway. 2007. ESV 2 Samuel 1:17-18 text reads: "And David lamented with this lamentation over Saul and Jonathan his son, and he said it should be taught to the people of Judah; behold, it is written in the Book of Jashar. He said: …." ESV 2 Samuel 1:18 footnote 1, at "he said it," reads: "Septuagint; Hebrew the Bow, which may be the name of the lament's tune."
blueletterbible.org
Blue Letter Bible, LXX 2 Sam. 1:18, accessed 14 January 2014.