PSALM 96 Unity in worship

Psalm 96:1 NIV Sing to the LORD a new song;
       Sing to the Lord all the earth.

The call to worship is to all nations.

Psalm 96:3 NIV Declare his glory among the nations
       his marvelous deeds among all peoples.

The worship of God is to be universal.
This Psalm is attributed to David ( 1st Chronicles 16:23-33 )
this Psalm of David is most inclusive
and is not at all exclusive.

Psalm 96:7 NIV Ascribe to the LORD, O families of nations
       ascribe to the LORD glory and strength.
Psalm 96: 9 NIV Worship the LORD in the splendor of his holiness
       tremble before him, all the earth.

The vision of this psalm is of sweet unambiguous unity
in which individuals have really pledged their obedience and loyalty
to the Lord our God.
By definition, all who truly stand in the same obedience and loyalty
are in most joyful unity.