"Praise the Lord, all Gentiles;
Laud Him, all peoples!
For His merciful kindness is great toward us, And the truth of the Lord endures forever.
Praise the Lord!" Psalm 117:1-2

Psalm 117 is the shortest of the Psalms and comes between two Psalms of thanksgiving. The title of Psalm 116 in my NASV is entitled "Thanksgiving for Deliverance from Death and in Psalm 118 "Thanksgiving for the Lord's Saving Goodness. It is perfectly placed!

'Praise the Lord, all Gentiles;
Laud Him all peoples!'

Scripture tells us that praise looks good on us, "Rejoice in the Lord, O you righteous!
For praise from the upright is beautiful." Psalm 33:2 Scripture also tells us that God has given us, "...The garment of praise for the spirit of heaviness." Isaiah 61:3 So we see that praise is not only pleasing to the Lord but it is beautiful and uplifting to those who are giving Him the praise.

Scripture also gives us ways to praise God as we see in the following:
In song (the Psalms are filled with admonitions that encourage us to sing praises):
"Sings praises to the Lord, who dwells in Zion; Declare His deeds among the people." Psalm 9:11

"Oh come, let us sing to the Lord!
Let us shout joyfully to the Rock of our Salvation." Psalm 95:1

"Oh sing to the Lord a new song!
Sing to the Lord, all the earth.
Sing to the Lord, bless His name..." Psalm 96:1-2

With musical instruments:
"Praise the Lord with the harp;
Make melody to Him with an instrument of ten strings." Psalm 33:2

And we all know Psalm 150,
"Praise Him with the sound of the trumpet ; Praise Him with the psaltery and harp!
Praise Him with the timbrel and dance;
Praise Him with stringed instruments and organs!
Praise Him with loud cymbals;
Praise Him with clashing cymbals!..." Vs. 3-5

Praise is to be universal:
"Let the peoples praise You, O God;
Let all the peoples praise You." Psalm 67:3

Praise is to be perpetual:
"Therefore by Him let us continually offer the sacrifice of praise to God, that is, the fruit of our lips, giving thanks to His name." Hebrews 13:15

1 Peter 2:9 gives us a four-fold reason why we praise our Lord:
"But you are a chosen generation, a royal priesthood, a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light."

A chosen generation, a royal priesthood, His own special people, a holy nation, called into His marvelous light!
Therefore why, oh why, would we not praise our God in song, on instruments, universally and always?!

So we join with the Psalmist and shout,
"LET EVERYTHING THAT HAS BREATH PRAISE THE LORD."
Psalm 150:6

Amen