The rock-a-billy style of Elvis Presley came out of his own roots in the southern United States.

Now, his fans are set to get 'All Shook Up' over a new 4-CD compilation detailing the entire recording career of 'The King of Rock-n-Roll.' The collection is being released to coincide with what would have been the King's 75th birthday, next month.

Elvis may have left the building, but he never left the hearts of his legions of fans.

To mark the King of Rock's 75th birthday next month, RCA/Legacy is releasing a 4-CD compilation, 'Elvis 75: Good Rockin' Tonight.' The collection includes 100 digitally restored tracks including hit singles, rare cuts, live performances, and all 30 number-one songs such as 'Heartbreak Hotel', 'Hound Dog', 'Jailhouse Rock' and 'Suspicious Minds'. The set also features a 7-thousand word essay by music critic and historian Billy Altman, along with many rarely seen photographs.

Altman says unlike previous 'Best Of' compilations, this one contains the rock legend's entire career.

Presley died on August 16th, 1977 at the age of 42, yet he remains one of the most recognizable faces of American music and popular culture. He starred in 33 films and received gold, platinum, or multi-platinum awards for 150 different albums and singles.

The release of 'Elvis 75: Good Rockin' Tonight' coincides with a 4-day celebration of his 75th birthday from January 8th, 2010. Altman says that if Presley was still alive today, the music icon would probably have returned to his earlier roots.

Billy Altman, music critic and historian, said, "I think that he would have turned into something different. I think at the time that he passed away he had gotten so much back in touch with his country and his gospel roots and I think if he was alive today he would have been 75 this January, I think he would have been kind of an elder statesman, probably more of country music than anything else which was really his first love."

'Elvis 75: Good Rockin' Tonight' is now available, with a 26-track 'Elvis 75' single CD hitting store shelves on January 5th, 2010.