This paper addresses the crucial need for comprehensive guidance in repertoire selection and technical development for pre-collegiate collaborative pianists. By compiling an annotated repertoire list, this research aims to assist teachers and pianists in navigating the developmental stages of collaborative piano work. The guide focuses on establishing foundational skills and techniques necessary for effective collaboration with various instruments, emphasizing the pianist's role as a musical partner. Drawing from the University Interscholastic League (UIL) list, the repertoire choices span a range of musical styles and periods, ensuring a balanced progression of difficulty. The paper talks about essential collaborative piano techniques, including hand and wrist position, physical coordination, listening, voicing, balance, pedaling, and breathing, providing a comprehensive overview to aid in successful ensemble performances. Each piece in the repertoire list is accompanied by detailed performance notes, addressing both pianistic and ensemble considerations. Additionally, the difficulty levels of the compositions are assessed with reference to established pedagogical literature. By offering a structured approach to repertoire selection and technical development, this annotated guide serves as a valuable resource for pre-collegiate collaborative pianists and their instructors, facilitating their growth and proficiency in collaborative music-making.