Psalm 95

God is above all and worthy to be praised!    
This psalm is both a public call to worship and a warning against falling away.

The tone is exuberant.  Great joy and excitement is expressed in praising God. It is a call to come before Him with hots and singing, thanksgiving and song.

He is worthy because He is the Great God.....above all others.  He formed the earth and sustains it....from the depths of the sea to the tops of the mountains.  They are His.

Worship Him!.....with fear and reverence, awe and wonder, for this Great God is our God....we are the sheep of His pasture.  He is our Great Shepherd.

Be steadfast!   We are warned to take heed to not be like those whom God rescued from Egypt....who saw His great works first hand and experienced His great salvation.  They turned their hearts away even so, and tested Him in the wilderness for 40 years.  They turned to other things and worshiped other gods, and were oh, so un-thankful for all He did for them and was to them.
The did not get to enter the promised rest in Canaan because of their unbelief.   We are warned not to be like them.
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I am drawn to Hebrews 12, where this passage is reviewed, warning us again, in the NT era, to beware of turning and not entering the still promised rest of eternity in God's presence.

He is still the great God,
We are still the sheep of His pasture,
We still try Him in our wilderness.

The call to worship with joy and singing is as good today as it was in Biblical times.
As is the plea to be steadfast.

NKJV notes:   "worship must be more than vocal and formal.  It is a heart attitude.