Psalms 80:2 - Ellicott's Commentary On The Whole Bible

Before Ephraim... — The tribes named from Joseph’s sons and his uterine brother naturally range together; they encamped side by side on the west of the Tabernacle, and when the ark moved forward they took their places immediately behind it to head the procession. The preposition “before” would alone show that this ancient arrangement, and no recent political event, determines the manner in which the poet introduces the tribes. It is used of a funeral procession (2 Samuel 3:31; Job 21:33).