I have read pages 278 to 288 of An Introduction to the Old Testament by Temper Longman and Raymond Dillard along with pages 71 to 78 of a book of the same title but authored by David Carr.
In Carr’s book, the chapter looked at some texts in the Bible that contain strong “echoes” of past ancient empires in the biblical texts, specifically the books of Proverbs, Ecclesiastes and Song of Songs. These echoes may indicate that these texts were written during the early monarchy when scribes were most dependent on foreign models in creating the first Israelite written corpus. Some of these texts were traditionally attributed to Solomon while others are originally anonymous.
Since Proverbs is a collection of collections, it is particularly difficult to summarize with a single theme or set of themes. Nevertheless, major features of the book include its prominent focus on female figures toward the beginning (1-9) and end (31:10-31), and its repeated emphasis on the importance of the “fear of Yahweh” (1:7, 29; 2:5; etc.) throughout.
The lead themes through most of Ecclesiastes are the absurdity of all human striving and the daily pleasures of daily life. Yet, the last verses of the book as well as isolated sections in its midst affirm the more traditional idea that good eventually is rewarded and evil punished. Many would take these more traditional affirmations to be late additions to the book.
As for Song of Songs, many readers insist that one must decide that it is either about human desire or about divine-human love. The poetry of the Song, however, is more elusive. The dense metaphors and disconnected dialogues invite readers to build their own images of what is happening. The lack of explicit divine references and other features of the Song suggest that the book was meant to evoke the drama of human love. Still, the poetry allows multiple readings, especially now that the Song stands in a Bible that elsewhere depicts God’s love for His people.