The problem of the authorship of the Psalms is one of the thorniest in the Old Testament. One hundred psalms are ascribed to definite authors: one is ascribed to Moses (xc.), seventy-three to David, two to Solomon (lxxvii., cxxvii.); and yet there are not a few scholars who maintain that, so far from any psalm being Mosaic, or even Davidic, there is not a single pre-exilic psalm in the Psalter, and the less radical critics do not allow more than thirty or forty. The question must be settled entirely upon internal evidence, as the superscriptions, definite as they often are, are never demonstrably reliable, while some of them are plainly impossible. To begin with, doubt attaches to the meaning of the Hebrew preposition in the phrase, "Psalm _of_ David." It is the same preposition as that rendered by _for_ in the phrase, "For the chief musician," and as in this phrase authorship is out of the question, it may be seriously doubted whether it is implied in the phrase rendered "Psalm of David." This doubt is corroborated by the phrase, "Psalms of the sons of Korah." Plainly all the Korahites did not cooperate in the composition of the psalms so superscribed; and the most natural inference is that the phrase does not here designate authorship, but that the psalm is one of a collection in some sense belonging to or destined for the Korahitic guild of temple-singers. [1] In that case the phrase would have a liturgical sense, and the parallel phrase "of (or for) David," might have to be similarly explained. It must be confessed, however, that whatever the actual origin of the superscription, "of (or for) David," it certainly came to be regarded as implying authorship--the many historical notices in the superscriptions of Psalms li.-lx. are proof enough of that; and no other explanation is possible of the superscription "of Moses" in Psalm, xc (cf. Is. xxxviii. 9, the writing of Hezekiah). [Footnote 1: It is not absolutely impossible that the phrase might point to a collection composed by this guild, cf. "Moravian brethren." But the other supposition is more likely.]