Bartoli is considered a coloratura mezzo-soprano with an unusual timbre. She is one of the most popular (and one of the top-selling) opera singers of recent years.[1]
This can maybe be expanded more. While stating that her voice is "unusual" is accurate, it does not describe what that means to a non musician and someone who doesnt know her music. It also fails to acknowledge her important parts of her youth and her years growing post Conservatory Santa Cecilia.