The purpose of this study is to examine the various signatures of compositional style as manifested in the keyboard percussion trios Rain Tree by Toru Takemitsu and Wind Trace by Toshi Ichiyanagi. Significant personal interaction between the aforementioned Japanese composers and American composer John Cage justifies an investigation of his influence on their compositional styles. Toru Takemitsu is currently one of the most prolific Japanese composers. In 1981, Takemitsu composed the percussion trio Rain Tree. Three years later (1984) the Japanese concert pianist Toshi Ichiyanagi composed Wind Trace using Rain Tree's identical instrumentation of marimba, vibraphone, and crotales. Rain Tree and Wind Trace are very similar in compositional style. Formally, both works are single-movement compositions employing rhythmic tension, harmonic dissonance, and visual imagery created by the use of polyrhythms, aleatory, nonfunctional harmony, and extra-musical references. This study investigates the Japanese philosophy of ma and its influence in Rain Tree and Wind Trace. Ma is the natural pause or interval between two or more phenomena occurring continuously. According to Takemitsu, ma is living space, more than actual space. Both compositions utilize space as an essential compositional technique to either connect compartmentalized activity or to complement melodic material. With the utmost respect for nature, Toru Takemitsu and Toshi Ichiyanagi have synthesized elements of Oriental and Occidental music into compositional styles that are unique yet universal. Functioning within both composer's strong personal aesthetics, the affective use of aleatoric and polyrhythmic structures reflect John Cage's influence. Takemitsu's decision to reevaluate the qualities of Japanese traditional music, and to consciously attempt to express the qualities of nature within his music, are attributable to his associations with John Cage. Rain Tree and Wind Trace are virtuosic vehicles of musical expression for which an understanding of the subtle elements within the Eastern and Western art forms is essential.