Wilhelm Friedemann Bach
He was born in Weimar. He was the son of Johann Sebastian Bach, who taught him to play the harpsichord and organ. Johann Sebastian wrote some pieces and put them in a book called Notebook for Wilhelm Friedemann Bach. Although they are in order of increasing difficulty, it is not known if these were used to teach him to play, or how to write music. The book does contain two allemandes and four preludes written by Wilhelm Friedemann. He also learned to play the violin.