Standard writing conventions say that when referring to an artist, you use his/her most recent work to identify him/her (Staying within the appropriate season). Therefore it would be the "Angel's Cry" songstress (or whatever you want to call her). However, for goodness sake, don't botch her song titles! But I guess this goes to show that the author is a fan, because most people wouldn't even know "Prisoner," let alone "Vision of Love."