That IU song is very addicting indeed, but i prefer the japanese version =)
Does anyone knows moumoon (japanese group)? I love "Sunshine Girl" and many others songs.
I'm more of a J-pop/rock person. Maybe it's because I watch Anime, but I find Japanese sounds "smoother" than Korean. I find female vocals suit the Japanese/Korean language better than English, especially when it comes to pop.
Kokoro Keshiki is a decent album by the voice actor Itou Kanae. I believe it's a sort of a one-shot album/compilation of various Anime openings.
I haven't seen many people talk about YUI, which I found surprising since I think of her as one of the top J-rock-pop artists. In fact I heard about her through one of Project86's reviews. She has a really airy voice which sounds great through AKG K701's and pretty much anything with good treble.