"Sing to Yahweh a new song" (v. 1a). What is the significance of a new song? I will suggest some possibilities: To compose a new song requires a welling up of energy within the composer. To compose a new song for singing to Yahweh requires a welling up of faith and devotion. There is something fresh and exciting about new songs. Musical tastes change, so an old song might not speak to a new generation. "for he has done marvelous things!" (v. 1b). The psalmist explains why he is calling people to sing Yahweh a new song. It is because Yahweh has done marvelous things––has accomplished wonder after wonder.
This is one of a number of psalms that include a superscription concerning David. Readers through the centuries have interpreted “A Psalm by David” to mean “A Psalm written by David,” but a number of scholars question that interpretation today. There are a number of reasons for that, including the fact that “several Davidic psalms refer to the ‘temple’ (e.g., 5:7, 27:4; 65:4; 68:29” (Broyles, 28)—but the temple was built by David’s son, Solomon, and was not in existence during David’s lifetime.