Knowledge: Sarah Mills first came out with her book called "Never Again" in 2000. On the other hand, Petra debuted with "Here Comes Jesus" in 1946.

Conversation:
I enjoy gospel music when I hear it, but I don't know a lot about it.
Gospel music is a Christian music genre.
Who are some of your favorite gospel music artists?
No favorites here, still I know of Petra. They're regarded as a pioneer for Christian rock and also contemporary Christian music genres.
Oh, I have never heard her. Do you know when she first came out?

Response: Sure, she first came out in 1946.