I'm a bit perplexed by how the city names were collected. Being Swedish, I'm used to our city names being problematic to fit into the English alphabet. Uusually 'å','ä' => 'a', 'ö' => 'o' works out quite nicely, but on this site, they'd sometimes get translated as 'ö' => 'a' or 'ä' => 'd'. It all just seemed, well, random.

Cool, but every city I tried is searching for the same shitty pop songs

Can it be twins if the relationship is only one way?

For example, New York's twin is Singapore, but Singapore's twin is Tegucigalpa in Honduras.

Are the cities always supposed to be on different continents? Because Perm, Russia and it's "twin" Homyel, Belarus are both in Europe.

Awesome! I'd love it even more if you could automatically make a Spotify playlist from the results.