Psalms 76:1 - Ellicott's Commentary On The Whole Bible

Judah... Israel. — A comparison with Psalms 114:1-2, leads to the conclusion that these names are introduced here in this order, simply for the rhythm. (Comp. “Salem” and “Sion” in the next verse, and notice that the four names offer an instance of introversion, the more restricted terms, Judah, Sion, occupying the first and last clauses, the more general Israel, Salem, the middle ones.)