1. A psalm. Sing to the Lord a new song, for He has performed wonders; His right hand and holy arm have wrought deliverance for Him.
2. The Lord has made known His salvation; He has revealed His justice before the eyes of the nations.
3. He has remembered His kindness and faithfulness to the House of Israel; all, from the farthest corners of the earth, witnessed the deliverance by our God.
4. Raise your voices in jubilation to the Lord, all the earth; burst into joyous song and chanting.
5. Sing to the Lord with a harp, with a harp and the sound of song.

Tehillim Ohel Yoseph Yitzchok (Kehot Publication Society)

Tehillim is recited by Jewish people collectively and individually, as the desire occurs to offer praise and thanksgiving to G-d; or alternitavely, in times of crisis and need, as a form of supplication, and even as a venue to express regret for sin.

6. With trumpets and the sound of the shofar, jubilate before the King, the Lord.
7. The sea and its fullness will roar in joy, the earth and its inhabitants.
8. The rivers will clap their hands, the mountains will sing together.
9. [They will rejoice] before the Lord, for He has come to judge the earth; He will judge the world with justice, and the nations with righteousness.