Final answer:
Girl groups of the early 1960s were mostly made up of African American females who were instrumental in shaping the music industry and breaking racial barriers.
Step-by-step explanation:
Most of the girl groups in the early 1960s were comprised predominantly of African American females. This demographic of artists played a crucial role in shaping the music industry at the time, producing hits that are still celebrated today.
Performers such as The Supremes, The Ronettes, and The Shirelles brought a new sound to the pop scene, blending rhythm and blues with more traditional pop music elements. These groups also served as important figures in breaking racial barriers in the music industry and society at large.