When United States emerged as a strong nation both politically and culturally in the second half of twentieth century, it has left its mark in all the parts of the world with its pop songs such as Adele Rolling in the Deep. You have some important pop songs of twentieth century that captivated the hearts of people and made them crazy. One such fine example is Rolling in the Deep cover. They are all time favorites though they emerged in the middle of twentieth century. The pop song Rock Around the Clock by Bill Haley and Comets was the first rock and roll hit and it sold nearly twenty five million copies. There are some real originators of the style and in that time period it became necessary for the whites to champion the music to a big gang of audience and the Comets were hailed for their work.