Which book is described as the "Songbook of God's covenant people"?

The Psalms is often referred to as the "Songbook of God's covenant people" because it is a collection of hymns, prayers, and poems that express the worship, struggles, and triumphs of those in a covenant relationship with God. Throughout the history of Israel, the Psalms have been used in both personal and corporate worship, serving as a means for expressing the full range of human emotions towards God, including praise, lament, thanksgiving, and confession.

Psalms encompasses a wide variety of themes and can be made relevant to various circumstances, which makes it suitable for both individual reflection and community worship. This characteristic reinforces its role as a unifying songbook that captures the essence of the believer's relationship with God within the context of His covenant promises.

In contrast, the other options do not encapsulate the same collective and spiritual hymnody as the Psalms. Job primarily deals with themes of suffering and divine justice; Proverbs provides wise sayings and practical advice for living; and the Song of Songs is a poetic dialogue celebrating love, which, while beautiful, does not serve the same broad liturgical purpose as the Psalms.