Teachers are responsible to know their subject area. Teachers are responsible to prepare their lesson plans and be ready to teach. Teachers are responsible to be aware of every aspect of what's happening in their classrooms. Students are responsible to listen to the teacher while she is speaking. Students are responsible to learn during the span of the class.
Students are responsible to complete assignments well and on time.
Students are responsible to arrive to class on time, and be ready to begin. Students are responsible to grow and improve in their musical abilities after learning new techniques.