Even as a kid, I thought this setup was odd. During my sixth grade year, my middle school had three chorus teachers--Mrs. B. for sixth grade, Mr. T. for seventh grade, and Ms. M. for eighth grade.
That Summer, I thought, "Surely, they won't stay with that arrangement next year. How much money could each of those teachers possibly make by teaching only sixth, seventh, or eighth grade chorus classes?"
Sure enough, at the beginning of my seventh grade year, a new instructor, Mr. B., replaced all three chorus teachers. Was it the best move for the students? Hmmmm... Well...
...Yes, to some extent. It's reasonable to think a full-time teacher will be more motivated to commit to a job than a part-time one--in theory, at least.
