Of course, it would be easy and/or lazy to make all of the obvious jokes about Liberace, but this special was shot before he got carried away with the Las Vegas act. He was an entertainer in a tuxedo who knew he was an entertainer and was happy playing a piano for the viewers at home. His inclusion of his family on-stage is actually very sweet. You see this guy before he became a cartoon character in the context of his family.
If you have trouble viewing it here, head on over to the Internet Archive to either download it or watch it streaming there.