"And the Haifi, he has teeth / And he wears them on his face / And Mackeath, he has a knife / But the knife is not visible." This new cheeky tone of the young Brecht revolutionized theater. His plays are stirring, critical, and challenge the bourgeois society of his time. He aims to open the audience's eyes and motivate them to think for themselves. "Change the world, it needs it!" says Brecht. In this spirit, this book does not provide ready-made answers. It serves as a foundation for reflection and discussion and is also suitable as teaching material. In addition to biographical information, it contains poems, excerpts from letters, quotes, and images, as well as excerpts from Brecht's plays, including The Threepenny Opera, The Good Person of Szechwan, Galileo Galilei, Mother Courage and Her Children. The accompanying CD features songs and poems.