While the exact transition to Rock ‘n’ Roll cannot be pinpointed, Rock ‘n’ Roll was influenced by R&B through African American musical forms. The cultural factors that influenced rock was the cultural crossing of racial and class lines after WWII and the addition of a radio that stimulated a teenage culture. Through Rock ‘n’ Roll, “The King” known as Elvis Presley was brought to life. Presley was known for many amazing pieces one of which includes “Mystery Train” which was up-tempo, loose, flexible and had rhythmic feel and instrumentation changes. Although the spread of rock came with great success, it also stimulated a backlash. People saw rock as a mainstream expression of urban black music culture, having a sexual display. It was also said that rock was a rejection of traditional social roles where it was referred to as ‘noise’ rather than music.