On Dec. 4, 1956, Marilyn Evans entered--and exited--rock 'n' roll history. That was the day Elvis Presley stopped by Memphis' Sun Studio and recorded an impromptu session with Johnny Cash, Carl Perkins and Jerry Lee Lewis. Historians have long believed Evans was there too because she was dating Presley then and a voice assumed to be hers appears on the recording. 'That lovely creature sitting on top of the piano', the caption for the photo read in the next day's newspaper, is 'Marilyn Evans, ...