This study identifies a historical shift in classical music from experimentalism to conceptualism, particularly between Late Romanticism/Impressionism and Early 20th Century Modernism. Using professional performance frequency since 1996 as a retrospective measure of innovation, we estimate composer-level age-performance profiles for 35 canonical figures. Regression results reveal significant lifecycle differences: pre-1874 composers peaked later, consistent with sustained technical refinement, whereas post-1874 Modernists peaked notably earlier, often in their twenties, reflecting conceptual innovation. These findings persist through various robustness checks, controlling for instrumentation, duration, composer identity, and calendar year effects. The results support Galenson’s theory of artistic archetypes and highlight how shifting aesthetic values profoundly influenced both the timing and historical recognition of musical creativity.