Hehe, I used to stick to the radio, until I realized that there was better stuff out there. As I said earlier(I think in this thread, though maybe another), I like to check out the charts from various countries. There are definitely some awesome J-Pop songs, though Russia, Brazil, & India have some good singers as well. =D
And my favourite artists include Michelle Branch & Yui. And I few months ago I found a video of the latter singing one of the former's songs, XD. It was the only English song I've heard her sing, and I thought it was pretty good. ^^