Elvis Presley may be known as the King of Rock 'n' Roll, but the best Elvis songs reveal much more than just rock music. Elvis scored hits on the country, R&B and pop charts while also demonstrating blues, gospel and rockabilly influences. His performances, at one point, may have been deemed too hot for television -– he was once infamously shot from the waist up on 'The Ed Sullivan Show' -– but now prove he's simply one of the greatest artists of the 20th century.