Very cool! One small UI grip: When I play a song the control at appears in the bottom of the page blocks the footer on the main page.

I assume you looked into automating the charts for new countries/years. What were the blockers for that?

Thanks! I'll fix that. Re charts: English-speaking countries were easy to scrape automatically, and recent charts for most countries were findable too. But older charts for non-English markets are a different story. For old Italian top 10s, for instance, I ended up relying on my own judgment and the fact that I speak the language. Trustable repos simply don't exist for a lot of that material. That's why I think crowdsourcing is the right call here, even if it's slower. And honestly, I like the idea of making this a collective exercise.