Nelson Mandela has died at the age of 95. Mandela, who was South Africa’s first black president, was a symbol against racial oppression over the past few decades, and has been championed by various rock stars since the '80s.

Before he became South Africa's first black president, Mandela spent 27 years in prison for treason. Throughout the '80s, artists like U2, Bruce Springsteen and Peter Gabriel campaigned for his release, which finally came in 1990. U2's theme song for a new biopic about Mandela was recently released.

Musicians have been reacting on Twitter and Facebook since news broke of Mandela's death. Here are some reactions:

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