Determining which song was Elvis' biggest hit is a tricky thing, as he has enjoyed one of the longest and most successful runs in chart history.

Elvis Aaron Presley, born January 8, 1935, in Tupelo, Mississippi, was one of the most influential figures in American popular music and would be turning 90 this year if he were still alive. The success of his legendary sound — that groundbreaking mixture of rhythm and blues,

At Elvis' last Tuscaloosa concert, he sang "Don't Be Cruel," "Jailhouse Rock," "All Shook Up" and more of his greatest hits.

Elvis Presley would have been celebrating his 90th birthday today, but the King of Rock n Roll's life was sadly cut short when he died in 1977 at the age of 42