All three were very popular in India too. I agree with you that Gangnam style made Korean pop visible across the world. Kpop did have fans across but they were niche at the time. Gangnam style success paved the way for BTS and others to start stretching westward for their fanbase. Also Gangnam is a posh suburb/part of Seoul if I am not mistaken.

I LOVE George Michael and this song. As a child just like you I loved the song for the music. I also liked the words, at least the ones I could understand , though to be fair I was just singing the words without understanding them :D

Earth song was okay for me. I think I was a bit down on MJ after Dangerous Album. And my favorite message oriented song of his is Man in the Mirror, followed by We are the World and finally Heal the World. As a result Earth Song was not in my list though it is a very good song.

Cheers from a fellow #dreemerforlife