It's based off the Billboard yearly top 100 chart, which only tracks american music. I'd love to make more, but it's actually been quite hard to get charts for

It's based off the Billboard yearly top 100 chart, which only tracks american music. I'd love to make more, but it's actually been quite hard to get charts for other countries in a yearly format. Interestingly despite being american music, country which most vistors are from is....South Korea!