This study compares Busoni's two original piano compositions, Indianische Fantasie for piano and orchestra (Indian Fantasy), op.44, and Indianisches Tagebuch (Indian Diary) Book I. They represent Busoni's late period of maturity and new aesthetical points of view on music. Both pieces are originated from Natalie Curtis's The Indian's Book, and particularly the Indian Diary is very closely related to the Fantasy, for three of the four pieces in the former work directly quote sections from the latter. To provide clear understanding of the composer's intention in creating two different versions from the same origin, this research examines how Busoni demonstrates his aesthetical ideas of new music in these two Indian piano compositions throughout structural and formal analysis. Busoni's adaption of Indian folk song in these works for the piano aimed at integrating Indian folk element with his personal harmonic language, both of which emphasized freedom in nature.