Thanks to Middlebrow for informing me that Psalm 98 is a traditional Christmas psalm, despite the fact that it mentions neither Santa Claus nor Christmas shopping - nor Christ, except in eager anticipation.
1 Sing to the LORD a new song,
for he has done marvelous things;
his right hand and his holy arm
have worked salvation for him.
2 The LORD has made his salvation known
and revealed his righteousness to the nations.
3 He has remembered his love
and his faithfulness to the house of Israel;
all the ends of the earth have seen
the salvation of our God.
4 Shout for joy to the LORD, all the earth,
burst into jubilant song with music;
5 make music to the LORD with the harp,
with the harp and the sound of singing,
6 with trumpets and the blast of the ram's horn—
shout for joy before the LORD, the King.
7 Let the sea resound, and everything in it,
the world, and all who live in it.
8 Let the rivers clap their hands,
Let the mountains sing together for joy;
9 let them sing before the LORD,
for he comes to judge the earth.
He will judge the world in righteousness
and the peoples with equity.