Final answer:
The best evidence of musical integration in the early 60s came from the Motown record label, which was instrumental in breaking down racial barriers and achieving crossover success with both black and white audiences.
Step-by-step explanation:
In the early 60s, the best evidence of musical integration came from c) The Motown record label and its diverse roster of artists. During this time, Motown played a significant role in the racial integration of popular music as an African American-owned label that achieved significant crossover success. The label's music, characterized by a mix of rhythm and blues (R&B), soul, and pop, was embraced by both black and white audiences. This integration was a reflection of the changing social dynamics of the era and the beginning of breaking down racial barriers in the music industry and beyond.
While country and western music, traditional jazz clubs in New Orleans, and European classical music institutions have had their own influences and histories of integration to some degree, none were as influential as Motown in terms of truly bridging the racial divide in the American musical landscape during the early 1960s. Founded by Berry Gordy in Detroit, Motown not only produced a new sound that appealed to the broader American public but also brought African American artists to the forefront of the music industry during a time of significant social change.
The label represented a new era of American music that was less divided by race and more united by the universal appeal of its sound and talent. Acts like The Supremes, Marvin Gaye, and The Temptations were able to achieve widespread popularity and play a part in the movement towards a more integrated society.