There was certainly a transition in music from the 1950s to the 1960s. But 1950s pop music wasn’t simplistic or sappy as some would have you believe.
In looking at rap music origins, a song from 1972 by Italian singer Adriano Celentano has some familiar sounds. Listen for yourself.
Sir George Martin was known for his understated brilliance as producer for The Beatles. “I Am the Walrus” is one song that shows that brilliance.