Opinion:
In the early 60's there was an explosion of Black girl groups being produced, played on radio and garnering top 40 hit status in national radio popularity and 45 rpm record sales. This began in the New York - LA axis, but expanded to Detroit and beyond. The Crystals led the way, especially in terms of voice quality and production values. The Ronettes in particular shattered the norms of sexually provocative dress on stage. Their look was emulated by high school girls across the nation and provoked disturbing hormonal responses in schoolboys across the land, including yours truly. This was a significant development in the liberation, image and employment prospects for women (and particularly women of color) at the time. Both these groups had the benefit of the best songwriters in New York and best musicians in LA. This whole movement was inchoately masterminded by another repressed minority, the diminutive and misshapen Jew, Phil Spector.
Little Boy
Da Doo Ron Ron
Then He kissed Me