This is the only version period.. All others are covers and pay tribute to this rumor is that Lowell Fulson did not write it but this version is the template for all others.
Great song and version. I saw elvis at madison square garden do a great live version of this song. I enjoy both versions but elvis voice was a work of art! One thing about these great blues sungers is they were natural. No studio gimmicks. Great talent this man was. However elvis got me into blues gospel and country and at the end of his life opera