For the word of the Lord is upright, and all his work is done in faithfulness.
He loves righteousness and justice; the earth is full of the steadfast love of the Lord.
There are many places in the psalter where we are exhorted to "sing a new song" to God. Why all this novelty?
Calvin maintains that "new" means a rare or choice song. But we might also take "new" more literally, and accept that the song we sing to God is indeed a new one, one that has not been presented to other beings or powers, one that is premiered, as it were, for God first and God alone.
Teach me something new, O God, that I may sing your praises in language that hasn't been wasted on anything less than the Creator of all that is; in Jesus' Name. Amen.