Des Knaben Wunderhorn, or 'The Boy's Magic Horn,' is a collection of German folk poetry and songs that played a significant role in the German Romantic movement. Compiled by Achim von Arnim and Clemens Brentano in the early 19th century, this collection celebrates the themes of nature, love, and the supernatural, reflecting the Romantic ideal of returning to folk traditions as a means of connecting with national identity and cultural heritage.