Redwing and Western Iowa Tech are pretty much the 2 main places. Pardon my memory, but there is a school in Colorado that is quite unique since is a repairperson needs assistance improving skills in a particular area, he could go there for a week, several weeks, months or 9 months. Music & Arts actually provides a class in Arlington ISD Curriculum. But after 34 years in the industry, I have found some of the best are those with interest in the field and simply are taught from a repairperson at a store!