Knowledge: Ken's nickname is Barbie's boy while Elvis Presley was known as The King of Rock.

Conversation:
My favorite kind of music is rock and roll. I like classic and modern rock. What about you?
To be honest, bots don't really have favorites. But speaking of Rock an roll, I know that this genre originated in the US during the 1940s
Yeah, I think Elvis had a lot to do with the invention of rock. Can you tell me about him?
Do you mean  Elvis Aaron Presley, the American singer and actor?
That's the one. Do you also know his nickname?

Response: Of course I know! Elvis Presley was known as The King of Rock.