The new teaching resource for lower secondary education follows a new concept of music education: the principle of progressive learning in music. Musical skills are acquired practically in their entirety and are closely intertwined with the exploration of cultural contexts. The new textbook aims to provide students from grade 5 with a systematic approach to music, offering many practical practice opportunities and fostering enjoyment in their own musical practice. This new textbook is designed for grammar schools, comprehensive schools, and secondary schools! The starting point is progressive learning in music. MusiX represents a paradigm shift: moving away from a content-oriented textbook often used as a "quarry" to a course book that adheres to the principles of progressive music education. Meaningfully sequenced learning steps lead to the development and consolidation of music.