 Originally the choreographer, Alex Romero, created a dance for the  song "Jailhouse Rock" that was in a style that was apropos for a  more classically trained dancer than Elvis. When Mr. Romero realized  that his plans for the number were never going to work, he asked  Elvis how would he normally move to the song; thus, this is how  Elvis became the uncredited choreographer for what could be  considered his most famous dance number in all of his movies.