It has its basis in the the 40s and 50's rock and roll.
Sure, it started in the 1940s and 1950s, and came into its own in the 1960s.
My friend loves rock music, but I don't know much about it. Do you like rock music? I have no preferences about rock music. Did you know it traces back to the 40s and 50's rock n roll music? I did not, I don't know much about it. Could you tell me a little about the focus on the songs? The lyrics focus on themes like romance but also about social and political issues. It's amazing how many different types of songs there are! Has rock music been around for awhile?
It has its roots in 1940s and 1950s rock and roll, a style which drew heavily on the African-American genres of blues and rhythm and blues, and from country music.