I (Shane) typically don’t reference web articles/blogs here because I don’t typically read articles/blogs on the internet. But I do keep track of an online publication of the OPC (Orthodox Presbyterian Church) called Ordained Servant. I recently read a helpful piece there by T. David Gordon called “The Israelites Were Not Exclusive Psalmists (Nor Are We)”. I’ll give a few excerpts of this article below; follow the link to read it in its entirety since the quotes below do not give the entire argument.
“The Old Testament not only contains a record of these non-Psalter songs [Ex 15, Deut 32, Judg 5, 1 Sam 2, 2 Sam 22, and Hab 3]; it contains approval of those who composed and sang them. Yet the compilers of the five collections that eventually constituted our canonical psalms did not hesitate to omit them. Had those compilers thought that their collections would have been regarded as exclusive, they almost certainly would not have excluded such well-known songs. If a strict view of exclusive psalmnody were held, we would be permitted to sing the 150 canonical psalms, but not permitted to sing these six other songs that are recorded elsewhere in the Old Testament. The Israelites could have lawfully sung them (and did), but we could not.”
“If one reads the canonical psalms, it is not at all surprising to learn that they were composed over the course of many generations, because so many of the psalms command the people of God to praise and extol him for his works or deeds of judgment and deliverance. In doing so, such passages command God’s visible people to compose such songs in response to all of what he has done. [Ps 9:11, Ps 13:6, Ps 66:1-3, etc.]”
“God disclosed himself much more supremely and definitively through his incarnate Son than he had ever before in any of his acts of judgment and deliverance in Israel; how could we possibly fail to sing praises for the greater and fuller act of judgment and deliverance in God’s own Son?”
“What the Colossians sang in their psalms, hymns, and spiritual songs were rich with the message/word about Christ” [Col 3:16].
covenant presbyterian church (OPC)