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Over the weekend, Prince held a “dance rally for peace” in Baltimore, dedicated to Freddie Gray and the people of the city. He announced the event, which took place at his Paisley Park home and studio, over social media, asking fans to wear grey for the 25-year-old Gray, who died on April 19.

According to NME, Prince reportedly recorded a new song as a tribute to Baltimore’s citizens. The Twitter invite is below: