Maria Margarethe Danzi
Maria Margarethe Marchand was born in Frankfurt, Germany. She studied voice and piano as a child. In the early 1780s she lived in the home of Leopold Mozart, studying piano and composition. (Leopold Mozart referred to her by the nickname "Gretl" in his letters.) She became an opera singer, best-known for her interpretations of W.A. Mozart's operas. In 1790 she married Franz Danzi, a cellist and prolific composer. She died in Munich in 1800.