the.com/rock and roll

means A music genre built on driving backbeats, blues chord progressions, and electric guitar that emerged in the mid-20th century and became the sound of youth rebellion.

from The phrase was blues slang for dancing, and often sex, long before it named a genre — 'rocking and rolling' shows up in blues and gospel lyrics from early in the 20th century. Radio DJ Alan Freed is widely credited with popularizing 'rock and roll' as a label for the new, guitar-driven music he played in the early 1950s, partly because it sounded racially neutral enough for white radio audiences while the music itself drew heavily on Black rhythm and blues traditions.