Final answer:
The two branches of folk revival during the 60s were the Blues revival, which focused on the traditional African American music, and the Protest song revival, which used music to advocate for social change.
Step-by-step explanation:
The two branches of folk revival during the 60s were Blues revival and Protest song revival, which sought to rediscover the raw authenticity of traditional African American music and to use music as a vehicle for social change and commentary, respectively. The Blues revival emphasized the historical significance and cultural impact of blues music, a genre deeply rooted in the African American experience. It saw a resurgence in popularity as artists from previous generations gained renewed attention and newer artists emerged to celebrate and evolve the genre. On the other hand, the Protest song revival was characterized by songwriters using their music to address and challenge societal issues such as civil rights, war, and injustice. Artists like Bob Dylan became the voices for this movement, with songs that questioned established norms and sought to inspire change.