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Prince debuts song about Baltimore at "Rally 4 Peace" concert

Prince took the stage in Baltimore before thousands of fans who were dressed in gray in tribute to a man whose death in police custody prompted riots and drew international attention.

See what Prince looked like in junior high

The pop star announced Sunday's "Rally 4 Peace" concert at the Royal Farms Arena Baltimore after weeks of protests over the death of Freddie Gray. During the show, Prince debuted a song he wrote for the city in the wake Gray's death.

"For those who have lost loved ones, we're here for you tonight," Prince told the crowd before launching a set that included his most famous hits.

Prince also called on the city's youth to fix a "broken system."

At one point, Prince invited onstage Baltimore State's Attorney Marilyn Mosby, who has charged six officers in Gray's death.

The concert was available on the streaming service Tidal.

Prince fans wait to enter a "Rally 4 Peace" concert in Baltimore, Maryland on May 10, 2015. Musical artist Prince is holding the concert in Baltimore on Mother's Day after the death in police custody of an African-American man sparked sometimes violent protests. Andrew Caballero-Reynolds/AFP/Getty Images

Prince recently embarked on a "Hit & Run USA" tour along with his band 3rdEyeGirl in which he announces surprise concerts just days before he performs.