Rock music is a genre of popular music that originated as “rock and roll” in the United States in the 1950s, and developed into a range of different styles in the 1960s and later, particularly in the United Kingdom and the United States. (W. E. Studwell and D. F. Lonergan, The Classic Rock and Roll Reader: Rock Music from its Beginnings to the mid-1970s)
So yeah, rock came from 40s/50s rock ‘n’ roll, which in turn is a form of pop music. So even The Carpenters or ABBA is rock, by that definition. So I am always comfortable to use the terms “pop” and “rock” fairly interchangeably, and get rather annoyed by the insane categorizations that is now so common.
In that light, let’s take a look at some of the different kinds of pop music, I am confident to label as ROCK!