Mazmur 77:1-4

Asaf : father of Joah, Hezekiah's recorder,son of Berechiah the Levite; music minister under David,father of Zichri; a Levite ancestor of some returnees,an official over the (Persian) king's forest in Judah

Sela : a musical notation for crescendo or emphasis by action (IBD)
(30° 19´, 35° 27´); (31° 46´, 35° 14´)

Yedutun : a Levite whose descendants returned from exile