THEOSISAthanasius the Great
There are a total of one hundred and fifty psalms. While some attribute all of them to the blessed David, there is no definitive proof of this claim. Although the psalms are commonly recognized by David's name, the titles indicate their true authors. David appointed four leaders of singers along with two hundred and eighty-eight who assisted them (1 Chronicles 25:7). Consequently, the psalms attributed to these four leaders can be identified from their headings. For instance, when it is mentioned, “A psalm for the sons of Korah, to Ephraim, Asaph, and Heman,” it indicates that these individuals performed the psalm. If it says, “The psalm of Asaph,” it clarifies that Asaph himself composed it. Similarly, when it states, “The psalm of Idithun,” it shows that Idithun is the speaker.
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When it reads, “A psalm of David,” it signifies that David is the direct author. Conversely, if it says, “A psalm for David,” it implies that it was composed for him by someone else. Among the one hundred and fifty psalms, seventy-two are attributed directly to David, nine are addressed to him, twelve to Asaph, twelve to the sons of Korah, one to Idithun, one to Ephraim, one to Heman, one to Solomon, and two to Haggai and Zechariah, along with thirty-nine that are as yet unsourced, and one to Moses. Thus, the total remains one hundred and fifty.