Prior to World War II, music popular within the African-American community was labeled "race music."
After World War II, "race music" was considered an offensive term.
"Blues and rhythm" was the term that RCA Victor used in 1948 to market what used to be called "race music."
Jerry Wexler, a music journalist, first used the term "rhythm and blues" while writing for "Billboard Magazine" in 1948.
In 1949, "R&B" became the industry term for music marketed to African Americans.