She is a true talent but really not well known outside of Holland. She is a fantastic singer with an amazing ability to interpret others' songs. What makes this all the more appealing is the lesser-known gems from many different genres she has reworked over the years.
Having said this her greatest moment is the album of all-originals "Water Under The Bridge" written with her band. A really wonderful if small collection of jazz-tinged moody pop. And she's also fantastic live although I've not seen her for at least 10 years.