Which of the following tasks is NOT among those assignments that text specifically lists concerning responsibilities Heinrich Isaac who served as private music master?

Heinrich Isaac was a Renaissance composer and music theorist. Some of his accomplishments listed include:

* Composed numerous sacred and secular works, including masses, motets, chansons, and instrumental pieces

* Served as choir director and music master at the court of Emperor Maximilian I

* Taught music theory and composition to Archduke Ferdinand

* Established a music printing press in Vienna

* Wrote a treatise on music theory called "De musica"