From the August 14, 2016, Chicago Tribune by Randy Lewis.
Answering this question brings lots of responses.
Some might say 1954, the year Bill Haley & His Comets recorded "Rock Around the Clock" and when Elvis Presley first stepped into Sam Phillips' Sun Studio.
Others might say it was 1964 when Beatlemania exploded onto the world and launched the British Invasion.
Some might say 1967 with the Summer of Love, the blossoming of Flower Power and psychedelic music. Not to mention the Beatles' "Sgt. Pepper's Lonely Hearts Club Band" album.
Still, others would say 1977 with the arrival of that "young, loud, snotty" music called punk rock.
Then there is the case of 1982 with Grand master Flash & the Furious Five's "The Message," putting rap music on the national map.
More recently, the year 2001 saw the birth of iTunes and redefined -- as well as broadened -- how we listen to music.
Of the ones listed here, I would have to say 1964.
What Say You? --RoadDog
MORE SUTHEN-ISMS: And, for those of you who are not from the South but have lived here for a long time, all y'all need to hang a sign to hang on y'all's front porch that reads, "I'm not from the South, but I got here as fast as I could."