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United States during the late 1940s and early 1950s.[page needed] It originated from African-American music such as jazz, rhythm and blues, boogie-woogie, gospel, jump blues, as well as country music. While rock and roll´s formative elements can be heard in blues records from the 1920s and in country records of the 1930s, the genre did not acquire its name until 1954. According to journalist Greg Kot, "rock and roll" refers to a style of popular music originating in the United States in the 1950s. By the mid-1960s, rock and roll had developed into "the more encompassing international style known as rock music, though the latter also continued to be known in many circles as rock and roll." For the purpose of differentiation, this article deals with the first definition.