Final answer:
During the early 1960s, girl groups became popular with teens, embodying the social and cultural changes of the Sixties and resonating with teenage experiences through themes in their music.
Step-by-step explanation:
The trios or quartets of female singers that became popular with teens during the early 1960s were known as girl groups. This period, often dubbed the Sixties, was a time of significant social and cultural changes. Girl groups like The Supremes, The Ronettes, and The Shirelles brought a new sound to the music scene, embodying the youthful and rebellious spirit of the era. Their music often addressed themes of love and relationships which resonated with the experience of teenage listeners.
The formation of girl groups and their impact on the music industry can be viewed as part of the larger cultural shift occurring at the time. The Second Wave Feminism movement, alongside the civil rights movement and anti-war protests, shaped the landscape of the Sixties, pushing for societal changes that included the way women were viewed and treated in society.