There are at least three artists named Xio:
1) A russian house/techno/drum'n'bass producer and dj. Real name Artem Malev. Started his career in 2001. A member of Reviez Family. Founder of Obtained Records label. PromoDJ, Last.fm user profile.
2) An ethereal/industrial female act.
3) UK Hardcore producer based in Sapporo, Japan. Currently signed with the labels Japanese With Force and Sprite Recordings.