response: I'm unable to say but around the mid-1960s was when it turns to "the more encompassing international style" of rock music
original_response: Perhaps in the 1950s and mid 1960s, as this was the time when the ''more encompassing international style'' of rock music came about
history: I love rock and roll music.  Do you know much about the genre? 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.  When was rock music the most popular?
knowledge: According to Greg Kot, ''rock and roll'' refers to a style of popular music originating in the U.S. in the 1950s prior to its development by the mid-1960s into ''the more encompassing international style known as rock music, though the latter also continued to be known as rock and roll.''