Simon Frith's analysis of the history of popular music from the 1950s to the 1980s has been criticized by B. J. Moore-Gilbert, who argues that Frith and other scholars have over-emphasized the role of "rock" in the history of popular music by naming every new genre using the "rock" suffix. Thus when a folk-oriented style of music developed in the 1960s, Frith terms it "folk rock", and the pop-infused styles of the 1970s were called "pop rock". Moore-Gilbert claims that this approach unfairly puts rock at the apex, and makes every other influence become an add-on to the central core of rock.