Final answer:
Alan Freed, a Cleveland radio disc jockey, is credited with coining the term 'Rock-n-Roll' and popularizing the genre among American teens in the early 1950s.
Step-by-step explanation:
The Cleveland radio DJ who first coined the term 'Rock-n-Roll' to come up with a new category label for crossover R&B was Alan Freed. He was instrumental in popularizing the genre by playing it on the radio during the early 1950s. Alan Freed also organized the first rock and roll concert and was influential in bringing this new music to the attention of American teens through radio broadcasts.
With artists like Sister Rosetta Tharpe, Jackie Brantson, and Ike Turner's Band laying the foundations, rock and roll amplified in popularity, finding a vociferous audience among young White people. The explosion of this music was largely due to technological advances such as the 45 record, the jukebox, and the solid-body electric guitar. These advancements, combined with the captivating themes of young love and freedom from middle-class society, made rock and roll the anthem of the youth.