The Book of Psalms commonly referred to simply as Psalms the Psalter or "the Psalms" is the first book of the Ketuvim ("Writings") the third section of the Tanakh and a book of the Christian Old Testament. The title is derived from the Greek translation ψαλμοί psalmoi meaning "instrumental music" and by extension "the words accompanying the music". The book is an anthology of individual Hebrew psalms with 150 in the Jewish and Western Christian tradition and more in the Eastern Christian churches. Many are linked to the name of David but modern scholarship rejects his authorship instead placing the composition of the psalms to various authors writing between the 9th and 5th centuries BC.