Who should be praised?
God should be praised.
Who should praise God?
Those whose life is in harmony with him.
Psalm 33:1-3 – Fitting
David said in the first verse that it is fitting for the upright to praise God. The word fitting means a harmony. It means that such things are proper and go together. Going together is but part of the story for things which are fitting do not merely sit side by side. Those things are interwoven. They mesh. They dovetail. They have a unity of motion like the notes of a symphony.
David said that it is fitting for a righteous person to praise God. Praise is a thing which the righteous among mankind should do. This may come in song or through music made on instruments. It should not be slovenly, but as skillful as one can make it. It also should be full of energy as a shout is.