There are some "chains" of piano training, such as ××× Piano Art Center, which is operated by a musical instrument store in Hong Kong and exists in the form of joining, but most of them are regional. There is a problem that can't be treated according to the meaning of "chain" in the strict sense, because the reproducibility of piano teaching is very weak, and it can't be a real chain in catering service industry, home appliance sales industry and so on. Paying attention to chain home mainly depends on its capital scale, risk control ability, cost advantage, unified service level and strict quality control means. These are far from being mentioned in the field of piano training. It's the same everywhere, depending on the local teachers, students and music atmosphere, there are great differences.