How many chapters is the theory of music and dance written in Sanskrit poetry?

The book "On Music and Dance" consists of 39 chapters, of which 28-33 chapters are devoted to music, thus forming a complete Indian music theory system. Chapter 28 discusses that the Indian scale consists of 22 "Shruti" and 7 basic tones, which constitute two basic scales: saxophone scale and Maldi scale. Chapters 29 and 30 introduce stringed instruments and wind instruments respectively, chapter 3 1 discusses rhythm, chapter 32 discusses related singing methods, and chapter 33 introduces the usage of drums.