Question: What German composer wrote a letter in 1770 addressing Lucrezia Aguiari's ability to perform in C sporano acuto?

Related documents: [0]  [DOC] Johann Georg Leopold Mozart (November 14, 1719 – May 28, 1787) was a German composer, conductor, teacher, and violinist. Mozart is best known today as the father and teacher of Wolfgang Amadeus Mozart, and for his violin textbook "Versuch einer gründlichen Violinschule". [END] 
[1]  [DOC] Lucrezia Aguiari (sometimes spelled Agujari) (Ferrara 1743/1746 – Parma 18 May 1783) was an Italian coloratura soprano. She possessed an unusually agile voice with a large vocal range that spanned slightly more than three and a half octaves; faculties that enabled her to perform the most difficult passage work. In a letter dated 24 March 1770 Leopold Mozart wrote of hearing her perform a C an octave above high C at the Ducal opera of Parma, "I could not believe that she was able to reach C soprano acuto, but my ears convinced me." Aldous Huxley also mentioned this event in his novel, "Brave New World", (misspelt as 'Ajugari'). [END]  
Answer: Leopold Mozart
Leopold Mozart