With everything that exists in the world, improvisation is possible. Anyone can participate, unleash their creative potential, and simultaneously invent and realize music with others. This understanding of improvisation shapes the twenty musical suggestions in this volume. They range from collective improvisation with and without guidelines to tonally oriented improvisational forms, as well as open, experimental concepts and graphics of new music from the 20th and 21st centuries, which is the focus of the book. Tried and tested in long-standing practice, the musical suggestions contain a variety of materials and inspirations for collective improvisation in concerts and lessons, supplemented by notes on the development, elaboration, and integration of the models into different contexts. A treasure trove for anyone eager to make and invent music together: amateurs and professionals alike.