Looking at the cross currents of historical and contemporary events
Hound Dog was from his second appearance on Ed Sullivan later that year. He was more sedate the first time, singing Love Me Tender.
Interesting piece on BBC today on how Elvis made Las Vegas. He was the first major star to sign a long term deal with the Vegas Hilton, legitimizing the gambling oasis as a rock-n-roll venue. http://www.bbc.co.uk/iplayer/episode/p00kdqzb/Strand_Extra_Elvis_The_Las_Vegas_Years/