Psalms

Author - Moses
The Psalms are a collection of Hebrew poems which were written over a period of about 1000 years. There were a dozen or more authors who composed the Psalms. Hebrew tradition holds that David compiled the Psalms with the help of ten elders.

While David didn't write all of the Psalms, still he is the primary author, which is why they are called Davidic. Many of the Psalms are ascribed to him and the New Testament ascribes many to him. (Acts 4:25 - Psalm 2; Hebrews 4:7 - Psalm 95) There is no reason to doubt the accuracy of the authors ascribed in the titles of the Psalms. The Psalms with no designation may well be Davidic Psalms, although there is no way of being certain. Their place within the cannon of Scripture is secured by their presence in the book of psalms.