The Reverend Dr. Martin Luther King Jr. once described the freedom songs of the civil rights movement as “the soul of the movement.” What would the civil rights movement, the anti-war movement, the Black Lives Matter movement be like without iconic songs like “We Shall Overcome,” the Plastic Ono Band’s “Give Peace A Chance” and Kendrick Lamar’s “Alright”? In celebration of Martin Luther King Jr. Day, we’re diving into the history of protest music in America.