For me it started when I began watching anime (so long ago that I can't even remember when that started). I always found myself singing along. I espcially loved the endingcredits song for Vampire Knight and looked it up. It was Still Doll by Kanon Wakeshima. I got on iTunes, found a bunch of her songs and then bought a bunch more from similar artists. Now, most of my iPod consists of Japanese music.
