This person has a shady “business” teaching people how to tune pianos as well as tuning them.

He is immediately rude, obnoxious and disrespectful. He also responds to polite inquiries disrespectfully.

His Yelp review.

A reddit post asking about him:

Even he, himself admit years ago that he has trouble finding people to teach. It’s amazing how people are so oblivious to their actions. He has trouble because he is unprofessional and has a nasty attitude. He’s also a huge liar.