Final answer:
Bill Haley and His Comets sang the song "Rock Around the Clock," marking the origins of rock and roll in 1955.
Step-by-step explanation:
The artist who sang the song "Rock Around the Clock," which is often credited with launching the rock and roll genre in June 1955, is Bill Haley. His band, Bill Haley and His Comets, provided youth with an anthem for their rebellion through this hit song. The popularity of the song after being used in the 1955 movie Blackboard Jungle only solidified its impact on the music industry and popular culture. The song was recorded in 1954, the same year as the historical Brown v. Board of Education Supreme Court ruling, creating a significant backdrop for the birth of rock and roll.