I’ve always been interested in learning other languages so it’d be cool to get some recommendations. So far, I’ve come to like Me!Me!Me! by Teddyloid, the instrumental for Headbanger by Baby Metal, J’en Ai Marre by Alizee, and Yuve Yuve Yu by The HU.
Years ago there was a song that always played for the ads on the Chinese phones. I tracked it down and the English translation of the title is “I caught a cold in that corner” by Fiona Fung. I don’t really consider it foreign language since it sounds mostly non-lexical.
I also have to give Cruel Angel Thesis an honorable mention.