Um...It is hard to tell, but what you are saing is 50% of truth. I am not Gamer so I only listen Original Sundtrack when I hear it is nice melody in video on Youtube, Metal Gear Solid 2 Main Theme is an example :)
Hm...Sometimes, I do hear US songs too, like Soledad, Heal The World, Nothing Gonna Change My Love For You, Mocking Bird, Hello, Wind Of Change...^^
Mostly, I am also enjoy listen J-Pop or Anime Songs. Actually, I am like how nice melody than meaning of the song. If you want, I can link you to my favourite songs, some have lyrics ( Romaji and English ) :D