Problems with music school rankings in selecting schools

How does one find gem teachers? Legwork, research, websites like this, talking to other parents and some creative thinking. We found out that there was a seminar being given in NYC based around a certain viola teacher’s methods and low and behold several of the viola teachers we had been hearing about were participating, so we went to the seminar. It cost, but nothing like traveling to six different states to take lessons with the teachers. My daughter was able to do masterclasses with a bunch of teachers on our list all in one week and we eliminated most of them. The seminar was not really for high school kids and certainly was not for the purpose of auditioning teachers, but it worked that way for us. To find the gems you have to do a little digging. ,