this is the sleep of one hundred years

Throughout the last decades of the 20th century, a new era of music was born. Revolutionary music is not a style or genre. We can call any kind of music revolutionary.
Bands like Public Enemy, or Rage Against The Machine had great success in the 1980s and 1990s. Lyrics about the fight for civil rights, and against racism, corruption, poverty are prevailing. One question still remains: what guided us to the conformation of revolutionary music?
In the middle of the 1970s, hiphop was born. A new sound was built from the penury of people and became rebellious. The most notable rap group with political messages is the Public Enemy. "With his powerful, authoritative baritone, lead rapper Chuck D rhymed about all kinds of social problems, particularly those plaguing the black community, often condoning revolutionary tactics and social activism." - As it is written in their biography. One of their most famous songs is "Fight The Power", which is an encouragement for the people to fight for their rights.
In 1992, a new release changed a lot of things in music. The self-titled album of the Rage Against The Machine brought together the sounds of hard rock and hiphop. The lead vocalist Zack de la Rocha became a symbol of revolutionary music. Legendary songs from the first album like "Killing in the Name", "Freedom", "Bombtrack" or "Wake Up" are all about their revolutionary left-wing viewpoints. They released "Evil Empire" in 1996, which was a lesser success. Their last self-contained album was "The Battle of Los Angeles", released in 1999. In 2000 they published "Renegades", which was a collection of covers of bands those are inspired Rage Against The Machine. But after the release of this album de la Rocha left the band, and RATM broke up.
Of course there are some other names, like Immortal Technique, or Looptroop. And reggae itself is a revolutionary genre. For example, Bob Marley, the most famous reggae artist (with his band The Wailers) had a lot of political messages in his lyrics. To be a little more subjective, one of my favourite reggae bands, Soldiers of Jah Army from Washington, also have a revolutionary strain. "The band grew up listening to reggae, hiphop, and rock. In their sound, reggae became the predominate influence because it is dedicated to a real message and promotes revolution." - quotation from sojamusic.com.
I find revolutionary music very important, the influence of these bands is really significant in the modern society.
Important links for this post:
Rage Against The Machine
Public Enemy
Soldiers of Jah Army
Zack de la Rocha #1
Zack de la Rocha #2