These lists compile the collective 2019 new-music listening of music fans in every country where people use Spotify, and in the fan communities for 2000+ genres and other genre-shaped distinctions.
The songs in each list are scored and ranked by a combined weighting of a) their absolute popularity with those fans and b) the share of the song's global listening that those fans account for. (And then filtered to one song per artist.)
This means, for example, that The Sound of Poland 2019 is the music that defines, unites and distinguishes Polish fans, whether that music comes from Poland or not.
Likewise, 2019 in K-Pop Girl Group is the music that fans of Korean girl-groups loved, whether it's Korean or Pop or Girls or not.
To be eligible, a song must have been released on or after 2018-12-01, as best our data can tell, so that's why no "Truth Hurts".