This dissertation will focus on the concepts of musical time of two solo multiple-percussion compositions, Thirteen Drums (1985) by Maki Ishii and Rebond A (1987-1989) by Iannis Xenakis. The aesthetic experience of musical works is tied to the perception of musical time. Performers have to understand the concepts and methods of construction of musical time in order to interpreting composer’s works. The model of cognitive process in neuroscience of music and the information processing theory from cognitive psychology is provided to explain the perception of musical time and its importance to the aesthetic experience of music. The rhythmic structure, which is essential in temporal structure to the perception of musical time, is examined in depth to show its significant influence on the aesthetic experience in both works. Rhythmic tension will also affect the aesthetic experience.