Answer :
Final answer:
Chief rocker device, or rock and roll music, emerged in the mid-1940s as a blend of uptempo blues, jazz, and country music. Sister Rosetta Tharpe and 'Strange Things Happening Everyday' and Jackie Brantson with 'Rocket 88' were early contributors. Rock and roll gained popularity in the 1950s through the efforts of disc jockey Alan Freed.
Explanation:
The chief rocker device, or rock and roll music as we know it, officially emerged in the mid-1940s as a blend of uptempo blues, jazz, and country music. It was predominantly created by Black artists and marketed to Black audiences. While there is debate over the exact first rock and roll recording, musicians like Sister Rosetta Tharpe and the song 'Strange Things Happening Everyday' and Jackie Brantson with 'Rocket 88' were early contributors.
Rock and roll gained popularity among American teens in the 1950s, thanks to disc jockey Alan Freed and his radio show in Cleveland, where the first rock and roll concert was organized. The genre celebrated themes of young love and freedom from societal norms, and was embraced by both Black and White artists and fans.
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