ruth-margret pütz (born margret doerkes, 26 february 1930 – 1 april 2019) was a german operatic coloratura soprano and teacher. she was born in krefeld-uerdingen, rhenish prussia, germany. she was a member of the staatsoper stuttgart for many years as a guest at the vienna state opera. her best known roles was as konstanze in mozart's "die entführung aus dem serail". she was one of the leading sopranos of the 1960s.