The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Psalms Chapter 39
Jeduthun
Jeduthun, a Levite, chief singer and instructor. See (Ch1 9:16); (Ch1 16:38); (Ch1 16:41); (Ch1 16:42); (Ch1 25:1); (Ch1 25:3); (Ch1 25:6); (Ch2 5:12); (Ch2 35:15); (Neh 11:17). He is mentioned in Psalms 39, 62, 77. Jeduthun was first called Ethan.