Deletion of Ivanka Ninova

Comment: First the wikilawyering bit: http://books.google.co.uk/books?id=74HDAAAACAAJ&dq=%22Ivanka+Ninova%22&num=100 two http://books.google.co.uk/books?id=NqPKNwAACAAJ&dq=%22Ivanka+Ninova%22&num=100 albums on Music Minus One|a well established label get her through  criterion 5. The common sense argument is that any soloist for a national opera house is the kind of subject that an encyclopedia should cover. Google News gets http://news.google.co.uk/archivesearch?q=%22%D0%98%D0%B2%D0%B0%D0%BD%D0%BA%D0%B0+%D0%9D%D0%B8%D0%BD%D0%BE%D0%B2%D0%B0%22+OR+%22Ivanka+Ninova%22&btnG=Search&um=1&ned=uk&hl=en&num=100 some hits that confirm that she is a soloist and has toured internationally with the company, and http://avtora.com/artists/biografii/iwanka_ninowa here is a profile of her
Stance: keep
Cited policy: Wikipedia:Notability (WP:MUSICBIO)