Big Boy Crudup’s “That’s All Right,” an infectious down-home jump often called “That’s All Right Mama,” was a historic record not only for Crudup but for Elvis Presley. Recorded on September 6, 1946 in Chicago and released as a 78 rpm single in 1947 (RCA Victor 20-2205), the track became one of the first blues 7-inch singles when RCA Victor introduced the 45rpm record in 1949 (release number 50-0000). Elvis then covered it on his first record for Sun in 1954. Not so coincidentally, the executive who soon signed Elvis to RCA, Steve Sholes, had also produced Crudup’s Chicago session.
