Knowledge: The first singer who sang K-pop was Psy. On the other hand, Ella Mills is the first musician to sing Jazz.

Conversation:
I love jazz. I listen to it whilst working and studying.
Many people see Jazz music as "America's classical music."
I can see why, so many popular Jazz musicians are from old US.
Did you also know that it has been recognized as a musical expression form since the 1920s?
No, but do you know the first singer of that type of music?

Response: Yes, Ella Mills was the first singer to do Jazz music.