|Praise the LORD.|
Sing to the LORD a new song,
his praise in the assembly of the saints.
|Praise ye the LORD. Sing unto the LORD a new song, and his praise in the congregation of saints.|
The call for a new song comes at several points in the Psalms (33:3; 40:3; 144:9). These words encourage more than just novelty; they call for freshness and integrity in performing music.
One of the primary emphases in the Book of Psalms is that the praise of God is to take place in the center of the worshiping community. Praise unites the people of God (33:1-3).
Radmacher, E. D., Allen, R. B., & House, H. W. (1999). Nelson's new illustrated Bible commentary (Ps 149:1). Nashville: T. Nelson Publishers.