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Hopsin released "Knock Madness" in 2013. The song was the lead single from his third studio album, Knock Madness. The album was released on November 26, 2013, and debuted at number 7 on the Billboard 200 chart. "Knock Madness" is a hip hop song with a dark and aggressive sound. The lyrics are about Hopsin's struggles with mental illness and his desire to overcome them.