We do not know the background or authorship of the psalm. It is a song of pure, exalted praise. The only instruction is that all His creation, a number of parts of which are detailed, are told to praise God.
This psalm is all about giving praise to God. Starting from the top down, let everything in Heaven praise Him (vss. 1-6), then in a long list of things on earth, concluding with young and old, men and women alike are to praise God. (vss. 7-12).
All of the things detailed in the Psalm, from highest to lowest are made by Him. The heavens, the angels, the clouds, the snow, the wind, the mountains and hills, the treats, the beasts, all cattle and all kings and all people, old young, great and small are made by God. It is only right that they all praise their creator.
13 Let them praise the name of the LORD,
For His name alone is exalted; His glory is above earth and heaven.
14 And He has lifted up a horn for His people,
Praise for all His godly ones;
Even for the sons of Israel, a people near to Him.
Praise the LORD!
The angels and inanimate objects of creation praise Him. Sadly, we often fail to as we should.