Albert Barnes Commentary Psalms 148:11

"Kings of the earth and all peoples; Princes and all judges of the earth;" — Psalms 148:11 (ASV)

Kings of the earth, and all people - This would embrace all, as all are included in the idea of the rulers and the ruled.

Princes, and all judges of the earth - Those of exalted rank; those high in authority. This is proper in itself considered, as they are people like other people; and proper as an example to the rest. None of any rank are exempt from the obligation to praise God; none are cut off from the privilege.