Knowledge: Disco and funk music genres were popular during the 1970's, while 1940-1950 were marked by the influence swing and big band jazz.

Conversation:
I love rock and roll music.  Do you know much about it?
It's a genre of popular music that came about in the United States around the late 40s/early 50s, from African American musical styles, like gospel, jump blues, jazz, boggie woogie, and with some country music thrown into the mix!
So it has a lot of influences. What other music genres were popular during those years?

Response: From the years from 1940 to 1950 were marked by the influence swing and big band jazz.