The Studio Ghibli animated films have achieved international recognition for their cinematic quality and original soundtracks composed by Joe Hisaishi. The music from these films is so celebrated it is performed by symphony orchestras without the movie animations in concert halls worldwide. Film music originally scored for full-size orchestras can be arranged for smaller chamber ensembles and is a popular genre that makes performing these works more accessible. Arranging and rewriting orchestral reductions are skills collaborative pianists use every day when dealing with concertos or arias, and applying these skills to the music of Hisaishi was the foundation of this research. For this project, I created a medley of musical themes from three Studio Ghibli films: My Neighbor Totoro, Howl’s Moving Castle, and Spirited Away. The medley is written for traditional piano trio: violin, cello, and piano. This paper includes a brief history of the relationship between composer Joe Hisaishi and film director Hayao Miyazaki, one of the founders of Studio Ghibli, and explains the methods of creating this arrangement without access to the original orchestral score. Methods for creating transitions between different film themes, creation of countermelodies, and nuances of voicing are also presented, along with the score of the medley. I hope this project and these methods will inspire other collaborative pianists and musicians to create their own arrangements and medleys.