Los Angeles (CNN)Perhaps it all started with "Go Down Moses" or maybe "Lift Every Voice and Sing." African-Americans have been using music and song for decades to protest slavery, oppression and discrimination. In recent months, there's been a reawakening of sorts.
--Trayvon Martin: The Skittles-carrying, hoodie-wearing teenager was shot to death by George Zimmerman in Florida in 2012. The former neighborhood watchman was later acquitted of second-degree murder.
--Ezell Ford: The 25-year old was shot during a scuffle with Los Angeles Police officers in 2014. His family said he was mentally ill. An oversight panel found one officer acted improperly, but he was not charged.
--Michael Brown: The 18-year old was fatally shot by Officer Darren Wilson in Ferguson, Missouri, in 2014 during a robbery investigation. Brown's death led to riots and looting. Wilson was not charged.