Why did the rock 'n' roll era begin in 1955?

Essay from the year 2004 in the subject American Studies - Culture and Applied Geography, grade: 1.3, LMU Munich (Amerika Institut), course: Proseminar: Popular Music and American Society, 1955 - Present: an Introduction, language: English, abstract: In this essay I want to discuss why rocknroll emerged at all and also why it did so at a certain time. When did the rocknroll era really begin? Was i...