The first rock and roll song is widely attributed to Jackie Brenston and his Delta Cats, which was actually Ike Turner and the Kings of Rhythm. It was recorded in Memphis by Sam Phillips in March 1951 and was released (strangely?) by Chess Records. (perhaps Phillips hadn’t started Sun Records yet)
About three months later, Rocket 88 was covered by Bill Haley and the Saddlemen. Both versions have been cited as the first rock and roll recording.
Here is Jackie Brenston and his Delta Cats: Rocket 88
Bill Haley and the Saddlemen’s version follows.