The article examines the scientific work of one of the prominent representatives of the 20th century Azerbaijani piano performing school, Honored Art Worker, Professor Nigar Usubova (1914–1994). N. Usubova devoted an important part of her life to pedagogical activity, raising a generation of talented pianists. She made an exceptional contribution to the development of the Azerbaijani piano school and the definition of its future directions. N. Usubova’s pedagogical principles are reflected in her dissertation work and methodical manual. As it is known, N. Usubova studied in the class of A. Goldenweiser and wrote these scientific works under the guidance of the prominent pianist. An important part of these scientific works is devoted to the study of A. Arensky’s piano creative activity. Here, the musician touched upon the features of the composer’s piano performing, as well as the characteristic features of his music. The research also provides performing characteristics of the works analyzed and covering various genres. The purpose of the research is to study the fundamental results and main performing principles in the scientific works dedicated to A. Arensky’s piano creative work by Nigar Usubova, a brilliant representative of the Azerbaijani piano school of the twentieth century. In these scientific research works, N. Usubova touched upon the features of the prominent composer’s piano creative work, performing principles, circle of images; moreover, analyzed the form, genre, tone and other aspects and conducted research on the background of characteristic features of Russian music. We would like to bring to your attention that N. Usubova’s scientific works have not been published. This raises the scientific significance and relevance of the topic more. These scientific works are the first research work dedicated to the study of A. Arensky’s piano music in the Azerbaijani science of music. The research methodology is based on analytical and theoretical analysis, as well as on the source research method (work with archival materials). The main principle is the study and analysis of the fundamental results obtained by N. Usubova in the study of piano music by A. Arensky The scientific novelty of the research is that for the first time the scientific works of the outstanding pianist Nigyar Usubov are studied, their scientific significance, as well as the issues reflected in those works, are revealed. We would like to bring to your attention that these scientific works reflect N. Usubova’s method of approach to A. Arensky’s piano pieces as a pianist. For this reason, these scientific works are a valuable recommendation for every pianist who turns to A. Arensky’s piano creative work. Conclusions. Nigar Usubova is the author of two scientific works and her scientific creative activity is devoted to the definition of performing features of A. Arensky’s piano creative work. Each of these scientific-methodical works was written under the guidance of a prominent representative of the Russian piano school, pedagogue A. Goldenweiser. In these works, N. Usubova worked on A. Arensky’s creative work in a comprehensive and detailed way. According to the author, A. Arensky’s piano creative work is characterized by the clarity of form and texture, the richness of melodic material, which brings him closer to Tchaikovsky’s chamber music. Although the composer prefers miniature forms in his piano creative work, it is also possible to find virtuoso pieces, etudes, scherzos and capriccios. These works, in particular, influenced the formation of S. Rakhmaninov’s and A. Scriabin’s creative activity. The main characteristic features here are polyphonism, polymelodism and polyrhythmics of the piano texture. Simultaneously, N. Usubova thoroughly studied the influence of Western European composers on the formation of A. Arensky’s creative activity.