1. For the Conductor, upon the gittit,1 by Asaph.
2. Sing joyously to God, our strength; sound the shofar to the God of Jacob.
3. Raise your voice in song, sound the drum, the pleasant harp, and the lyre.
4. Blow the shofar on the New Month, on the designated day of our Holy Day;
5. for it is a decree for Israel, a ruling of the God of Jacob.

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. He ordained it as a precept for Joseph when he went forth over the land of Egypt; I heard a language which I did not know.
7. I have taken his shoulder from the burden; his hands were removed from the pot.2
8. In distress you called and I delivered you; [you called] in secret, and I answered you with thunderous wonders; I tested you at the waters of Merivah, Selah.
9. Hear, My people, and I will admonish you; Israel, if you would only listen to Me!
10. You shall have no alien god within you, nor shall you bow down to a foreign deity.
11. I am the Lord your God who brought you up from the land of Egypt; open wide your mouth, [state all your desires,] and I shall grant them.
12. But My people did not heed My voice; Israel did not want [to listen to] Me.
13. So I sent them away for the willfulness of their heart, for following their [evil] design.
14. If only My people would listen to Me, if Israel would only walk in My ways,
15. then I would quickly subdue their enemies, and turn My hand against their oppressors.
16. Those who hate the Lord would shrivel before Him, and the time [of their retribution] shall be forever.
17. I would feed him [Israel] with the finest of wheat, and sate you with honey from the rock.