In performing arts, the piano ensemble literature has a wide variety of repertoire that demands versatile skills such as sight-reading, rhythmic stability, coordination and communication. Piano ensemble playing has a very different training discipline and learning process from the piano solo performance as it requests more collaborations and rehearsals. The programs for piano ensemble have both artistic and pedagogical purposes, which deserve an in-depth investigation. Most existing scholarly researches mainly address the compositions for piano duets and piano duos, as both genres domain the most majority in the piano literature. Some exceptions of studies mention the overall ensemble program for multiple pianists without specifying the artistic perspectives. However, the piano ensemble program is very diverse, and there is much more to be learned from the piano ensemble performance. In order to explore the significance of the artistry of piano ensemble music, the goal of this study is to examine the repertoire for piano ensembles with respect to its social function, stylistic change, compositional intent, and pedagogical strategies.