7 multiple choice 1 point up until the end of the 1930s the vast majority of recorded music was or sounded…

7 multiple choice 1 point up until the end of the 1930s the vast majority of recorded music was or sounded like: show tunes rock and roll swing jazz
Answer
Brief Explanations:
Rock and Roll emerged in the 1950s. Swing became very popular in the 1930s - 1940s but before that, jazz was a dominant form of recorded music. Show tunes were also around but not as prevalent as jazz in the pre - late 1930s recorded music scene.
Answer:
D. Jazz