Thanks! Data sources are shown here: https://github.com/matteocantiello/88mph
I agree it would be cool to not just expose the top singles of the year, but potentially choose the top songs in a different genre, so that pop isn't dominating. So maybe having the option to choose musical genre first (e.g. Metal, and the whole website's look changes to a dark-gothic UI :) and then navigate the charts of top metal hits for each country. Which reminds me I need to add Finland