This psalm was written by David, as appears from 1Ch 16:7 to whom it is ascribed by the Septuagint, Vulgate Latin, and all the Oriental versions. This and part of Psalm 105 were first composed and sung at the bringing of the ark from the house of Obededom to the city of David; and here it is detached from that with a new introduction to it, and applied to the times and kingdom of the Messiah, and; with great propriety, since the ark was an eminent type of him.
The inscription in the Syriac version is,"a Psalm of David, a Prophecy of the coming of the Messiah, and of the calling of the Gentiles that believe in him:''and very rightly, since express mention is made of them in it, and of the publication of the Gospel among them; and clear reference is had to Christ, who is the Jehovah all along spoken of Jarchi well observes, that wherever a "new song" is mentioned, it is to be understood of future time, or the times of the Messiah; and the end of the psalm shows it,he cometh to judge, &c.
Ver. 1. O sing unto the Lord a new song,.... A famous excellent one, suited to Gospel times, on account of the new benefit and blessing of redemption and salvation lately obtained by the Messiah; which should be sung to him, who is the Lord or Jehovah here designed, by all the redeemed ones, Re 5:9,See Gill on "Ps 33:3", the Targum adds,"sing, ye angels on high:''sing unto the Lord all the earth: not the whole land of Israel only, as Aben Ezra interprets it; though here the Saviour first appeared, taught his doctrines, wrought his miracles, suffered, and died for the salvation of his people; here the angels first begun the new song; and here those that believed in him first expressed that spiritual joy which afterwards spread through the whole world, and who are here called upon to sing; namely, all those that are redeemed from among men, throughout all the earth: believing Gentiles are here intended: the Targum is,"sing before the Lord, all ye righteous of the earth.'