What does Psalms Chapter 97 say, and which statements belong to its speaker?

Cantate Domino is the incipit and the separate heading interprets victories of Christ. David's psalm commands a new canticle because God has done wonders; His right hand worked salvation for Him and His arm is holy. It does not add without earthly aid. He made salvation known and revealed justice before Gentiles, remembering mercy and truth toward Israel's house; earth's ends have seen God's salvation. Seeing salvation is not equated to redemption of every nation.

All earth is told to sing joyfully, make melody, rejoice and sing. Harp and a psalm's voice, long trumpets and cornet's sound accompany joyful noise before the Lord as king. Sea and fullness, world and dwellers are invited to movement; rivers shall clap hands and mountains shall rejoice together before the coming judge. The mountains do not leap in this span. He shall judge world with justice and people with equity. The cosmic imagery remains attributed and future without an invented localized-memory crisis or established cosmic restoration outcome.