A record of Elvis, produced in Tennessee. What's so special about it, when everyone knows that the truck driver from the south already sobbed his first songs through the local radio? But "Elvis in Memphis" is much more than one of about 40 albums released by the Rock'n'Roll king in three and a half decades. "It's characteristic," enthused the otherwise cautious New York Times, "for perhaps the most impressive comeback in the history of pop music.