0_Apprentice
I love rock and roll music.  Do you know much about the genre?
1_Wizard
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!
0_Apprentice
So it has a lot of influences.  When was rock music the most popular?
1_Wizard
Perhaps in the 1950s and mid 1960s, as this was the time when the "more encompassing international style" of rock music came about