American folk music has its origins in oral traditions and tells the stories of working class people throughout history. It encompasses songs about labor struggles, war, civil rights, and other hardships. Important folk artists like Woody Guthrie, Pete Seeger, and Bob Dylan advanced the genre and used music to raise awareness about social and political issues important to the working class. Folk music experienced revivals in popularity during times of social unrest in the 1960s and continues to be inspired by struggles for justice.