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Story highlights

Report: Freddie Gray case prosecutor Marilyn Mosby joined Prince on stage

Prince took a jab at previous curfews; told youth that fixing the "system" is their responsibility

Pop star urges fans to wear gray

(CNN) —  

Pop star Prince made room for another color next to his signature purple in his Baltimore “Rally4Peace” concert Sunday – and next to his music for dash of political gestures.

“Wear something gray,” his promotional materials asked of patrons – in remembrance of Freddie Gray, who died from severe spinal injuries after his arrest last month. On the concert poster, an illustration showed Prince wearing it, too.

After protests over Gray’s death gave way to riots in the city, the singer-songwriter recorded a song called “Baltimore,” dedicated to residents and to Gray, in which he calls for justice and peace.

“The system is broken,” he shouted to the crowd at the Royal Farms Area. “It’s up to you young folks to fix it.”

Prince had announced he would come to town to play live. Audio from the concert was streamed free via the digital live music service TIDAL.

Mosby on stage

In addition to “Baltimore,” Prince played many of his hits, opening with “Let’s go Crazy.” But he hatched a surprise when he invited State’s Attorney for Baltimore City Marilyn Mosby to join him on stage, the Baltimore Sun reported.

Mosby is heading the prosecution in the Gray case and has lodged charges against six police officers. The officers’ attorneys have filed a motion to have Mosby’s office taken off the case.

They claim she has a conflict of interests, which she has denied.

The concert tickets were a Mother’s Day gift from Mosby’s husband, Councilman Nick Mosby, the Sun reported.

Curfew jab

Early on, Prince took aim at recent curfews that followed the rioting.