How we standardized music

This episode of Unexplainable explores the surprisingly complex history behind the standardization of the musical note A, specifically the adoption of 440 hertz as the global benchmark. The journey begins in the 17th century, when pitch varied wildly across Europe due to inconsistent tuning methods and environmental factors. The French Revolution sparked a push for rational standardization, leading to the adoption of A435 in France. Though this standard gained traction across Europe and the U.S., it ultimately failed to stick. The real turning point came in the 20th century, when American instrument maker John Deegan championed A440—not for scientific reasons, but as a strategic business move to dominate the American music market. His influence, backed by major music organizations, cemented A440 as the American standard. The global shift occurred in 1939, when European nations—including Britain, Germany, and France—convened at the BBC to align with the U.S. standard, not out of ideology, but to unify broadcast sound across borders. Despite this, the standard remains contested: some musicians prefer lower tunings for historical authenticity, while conspiracy theories falsely link A440 to Nazi propaganda or Jewish banking elites. Ultimately, the episode argues that musical standardization is less about universal truth and more about social agreement, collaboration, and context—especially within the moment of performance. The true purpose of the oboe’s A note isn’t to enforce a global rule, but to ensure that everyone in the room is in tune with each other, right now.