Generally, I don't listen to music in English much. Japanese music is my favorite. I suppose if the Japanese songs I listened to were in English I'd like them just as much. It's the artist not the language.
Anyway... my favorite artists are:
*Utada Hikaru (pictured in my ava and will soon debut her English album in the states. I wish her luck.)
*Maaya Sakamoto (my favorite artist in both languages)