2. The position of counselor is one of the university administrators, who specializes in managing all kinds of things of students and will not be linked to your major.
3. Generally, college counselors are full-time and will not let you take your favorite professional courses, which means that the chances of letting you take piano professional courses are very small.
4. To apply for a substitute teacher, you should find a school that needs a piano teacher and apply according to the school's annual recruitment model. Good luck @ !