 The Book of Psalms is a collection of 150 different songs which function as prayers. The Book of Psalms can be found in the Hebrew Bible or what the Christians call the Old Testament. The authorship of these songs is unknown but many are attributed to King David, although it is unlikely that he wrote all that were attributed to him. Psalms are intended to be sung or read responsibly and continue to be used in worship services today. There are a variety of Psalms including songs of praise, songs of lament, and songs of intercession.