Under a rock or unaware of what real talent is. People just aren't aware of the extent or the quality of his talent.
Michael was actually the first person to beatbox on a pop record with 1976's "Blues Away". He's amazing. When I saw him do it for Oprah I at first though there was music playing from a speaker somewhere because there were multiple sounds happening at once. When it occured to me that all of those sounds were coming from Michael's one voice box, it blew my mind. And when I showed Michael beatboxing for Diane Sawyer to my Dad, he was like "Dayum!", lol. He couldn't believe that was coming out of a person.