What key details about bernhard ziehn can be extracted from the following bio? Bio: bernhard ziehn -lrb- january 20 , 1845 -- september 8 , 1912 -rrb- was a german-american music theorist and music teacher .
- death date is september 8 , 1912- birth date is january 20 , 1845- name is bernhard ziehn- nationality is german , american- death place is chicago , illinois- birth place is erfurt , germany