Philosophical V. Practical

I've been thinking more and more lately about what makes a "good teacher." What abilities does a "good teacher" posses? Is he or she able to talk for hours about what music and teaching is, or is it someone that has practical abilities like handling a classroom, caring about the students, teaching lessons that students can understand and learn something from, etc. How important is it that a teacher is able to define terms (like music) in a purely philosophical manner? Is that going to make them a "good teacher?" I would like to think that the answer is a healthy combination of the two that falls more heavily on the side of practical, but from my experience in ME classes, I'm finding that others might think it's slightly heavier on the other side...