This is the earliest teaching material of music theory, with a long history and certain authority. Since then, Professor Li Zhongguang has published a large number of music theory textbooks. For example:
General Textbook of Basic Music Theory Li Zhongguang Higher Education Press (Textbook of Undergraduate Entrance Examination of China Conservatory of Music)
A Concise Course of Basic Music Theory Li Zhongguang People's Music Publishing House (textbook for undergraduate entrance examination of Central Conservatory of Music)
Basic Music Theory Li Zhongguang Hunan Literature and Art Publishing House
"Simple Music Theory Solfeggio Basic Course" Li Zhongguang Hunan Literature and Art Publishing House
In the past ten years, various basic music textbooks have been published one after another, and nine major conservatories in China have their own music theory textbooks.
Basic Music Theory Course Tong Zhongliang Shanghai Music Publishing House (Wuhan Conservatory of Music)
Modern Music Theory Course Tong Zhongliang Hunan Literature and Art Publishing House (Wuhan Conservatory of Music)
Basic Music Theory Course (Composition Volume) (Revised Edition) Ran Chengqi and Tong Zhongliang People's Music Publishing House (Wuhan Conservatory of Music)
Practical Music Theory (Second Edition) Liu Xiaoming and Yang Xiao Huacheng Publishing House (Xinghai Conservatory of Music)
Basic Music Theory Course Yuan Nankai University Press (Tianjin Conservatory of Music)
Basic Music Theory course exercises and reference answers Yuan Nankai University Press (Tianjin Conservatory of Music)
Shi and Gong, A New Edition of Music Theory, Shanghai Music Publishing House (Shanghai Conservatory of Music)
Basic Music Theory (attached 1 CD) Funi Central University for Nationalities Press (Central Conservatory of Music)
General textbooks for public courses in secondary art schools? Music Theory Course Zhang Juan Central Conservatory of Music Press (Central Conservatory of Music)
Funi Central Conservatory of Music Press (Central Conservatory of Music)
Jiang Kui Central Conservatory of Music Press (Central Conservatory of Music)
Zhang Hao, Zhao Yishan, Kong Yi, etc. Central Conservatory of Music Press (Central Conservatory of Music)