The specialist book "Measurability of Practical Musical Competencies of Students" offers a comprehensive analysis of music didactic approaches that place practical music-making at the center. A theory-based structural model is developed that systematically captures the practical musical competencies of students. In collaboration with music teachers, measurable test tasks were created, validated by empirical data from 420 students in the 9th grade. The results enable a well-founded discussion about the demands and realities of practical music-making in the classroom. This book is aimed at professionals in the education sector who are interested in the further development of music education.