Psalm 90 is the only one we know for sure.
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The book of Psalms is an ancient song-book, so it includes contributions from many authors. Some of these include King David, Asaph, and Moses. Many of the Psalms have unknown authorship.
The book of Psalms Writing was Completed: c. 460 B.C.E.
There are 150 psalms in the Bible. The Book of Psalms consists of 150 psalms
King David (Psalm 23 and many others), Solomon (Psalm 127); Eithan (Psalms 89), Yeduthun (Psalms 39), and Asaf (Psalms 81); Moses (Psalms 90); and the sons of Korach (Psalms 42). Those with whom King David contended: Avshalom (Psalms 3), Saul (Psalms 18), Avimelech (Psalms 34), Doeg (Psalms 52).
There are 150 chapters in the book of Psalms.