COCOA music is:
Composers of Ohio Collaborative Ogranization for Acoustic music
Maria Anna (Marianne) Mozart was born in Salzburg. When she was seven years old, her father Leopold Mozart started to teach her how to play the harpsichord. When she lived women did not work outside the home. As she became an adult she married and had children.
According to the New Grove, "from 1769 onwards she was no longer permitted to show her artistic talent on travels with her brother, as she had reached a marriageable age."
Her brother Wolfgang went on during the 1770s to many artistic triumphs while traveling in Italy with their father Leopold, but Marianne stayed at home in Salzburg with her mother.
There is evidence that Marianne wrote musical compositions, as there are letters from Wolfgang praising her work.