With a heavy dominance on its technical/empirical aspects, the segmented performance, pedagogy, and assessment of Western classical music is undermining its goal of creating art with precision, style, and expressive beauty. This segmentation has its roots in the quantitative assessment processes found in music education and in the note-perfect performance expectations of art organizations. The results are often heard in the uninspired performances of such vital music. As an alternative, an integral performance, educational, and assessment approach (the IPEA model) will be open for discussion. The IPEA model utilizes the concepts of upward causation (science) and downward causation (art) to equalize the elements found in the music quadrants and it continues with their evolutionary track through the "Spiral Dynamics" as designed by Beck and Cowan. An all-quadrant/multilevel pedagogical, performance, and assessment approach will result signaling a major shift in Western classical music by addressing the developmental needs of music students/performers without corroding their technical or expressive strengths. This model bridges the gap between the empirical and the artistic sides of music proposing, perhaps, the perfect marriage of two seemingly opposing cultures: science and art.