I agree, since rock and roll elements can be heard in 1920s blues records as well as 1930s country records. Rock and roll actually got its name in 1954.
While elements of rock and roll can be heard in blues records from the 1920s it was not called rock until the 50's
Rock and Roll is my favorite music genre, are you familiar with it? I'm aware that it is a popular genre of music and had its origins was during the late 1940s to early 1950s in the US. Yes rock and roll evolved from from African American musical styles such as gospel, blues, jazz, boogie woogie,along with country music. Sounds informative, were you also aware that classic rock and roll typically is played with 1 or 2 electric guitars? Yes, and in the earliest rock and roll styles, either the piano or saxophone was typically the lead instrument. The genre had other elements from genres before it too I believe.
While elements of rock and roll can be heard in blues records from the 1920s and in country records of the 1930s, the genre did not acquire its name until 1954.