David
Psalm 68:32ESV·traditional attribution

O kingdoms of the earth, sing to God; sing praises to the Lord, Selah

John Calvin Reformed @genevareformer

PSALM 68 In this psalm it was David’s design to celebrate the victories which, through the blessing of God, he had gained over his enemies; As to the time and occasion of the composition of this psalm, the majority of interpreters refer it to the translation of the ark from the house of Obed-Edom to Mount Zion, and with this every part of it would, no doubt, harmonize.

Commenting on Psalm 68:1-35

C.H. Spurgeon Reformed Baptist @princeofpreachers

Sing unto God, ye kingdoms of the earth. Glorious shall that song be in which whole empires join. Happy are men that God is one who is consistently the object of joyous worship, for not such are the demons of the heathen. So sweet a thing is song that it ought to be all the Lord's; a secular concert seems almost a sacrilege, a licentious song is treason.

Matthew Henry Presbyterian @wholebiblehenry

The psalmist, having prayed for and prophesied of the conversion of the Gentiles, here invites them to come in and join with the devout Israelites in praising God, intimating that their accession to the church would be the matter of their joy and praise (Psa 68:32): Let the kingdoms of the earth sing praises to the Lord; they all ought to do it, and, when...

Commenting on Psalm 68:32-35