At the Rose Bowl in Los Angeles on Sunday, Aug. 3, Jay Z called for California to support Prop 47, a November ballot initiative. "California, build more schools, less prisons," he said, before launching into his 1998 hit "Hard Knock Life."

It's possible he was prompted to do so after "many recent conversations about mass incarceration" with Dream Hampton, the author and activist who posted the above video on Instagram. Hampton and Jay Z previously worked as co-authors on Jay's 2011 memoir, Decoded.

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