The idea of this book is to share our joy of improvisation, to spark enthusiasm for playing with musical material, to stimulate creativity through the exploration of various musical possibilities, to initiate learning processes on how to transform a tiny idea into a long, exciting improvisation through small changes, and to provide ideas on how musicians can learn and practice improvisation alone at their instrument. This book is intended for beginners in improvisation who already have some musical background. It is also aimed at teachers and learners seeking inspiration in this area. The book is not meant to be followed rigorously in terms of text and tasks, but rather to encourage new, unexpected thoughts and inventions through engagement with the text and tasks. Consequently, the masculine form is understood to apply to both genders. As a Swiss publisher, we use "ss" instead of "ss".