The Book of Psalms, commonly referred to simply as Psalms, is a book of the Hebrew Bible and the Christian Bible. Taken together, its 150 poems "express virtually the full range of Israel's religious faith." They each have a poetic character with frequent use of parallelism. In addition to the title of the collection, which translates as "song" or "hymns" from both Hebrew and Greek, superscriptions (or headings) in many of the Psalms provide musical references and some direction, in some cases even references to melodies that would have been well known by early congregations. Songs that can...