John Legend has been a vocal advocate against mass incarceration and has worked with the #FreeTheVote campaign to raise awareness and advocate for voting rights for formerly incarcerated individuals.

The Gathering for Justice is an organization founded by Harry Belafonte that brings together artists, activists, and community leaders to address mass incarceration and other social justice issues.

Kendrick Lamar's album "To Pimp a Butterfly" explored themes of mass incarceration, police brutality, and the experiences of African Americans in the United States.

Meek Mill's song "Dreams and Nightmares" addresses the issue of mass incarceration and the criminal justice system, drawing on his own experiences with the justice system.

Jay-Z founded the REFORM Alliance, an organization dedicated to reforming the criminal justice system and reducing mass incarceration, in 2019.

The Freedom Concerts were a series of concerts organized by Harry Belafonte and other artists to raise awareness about mass incarceration and advocate for criminal justice reform.

Jay-Z's song "4:44" included the line "I can't breathe," a reference to the death of Eric Garner, who died after being placed in a chokehold by a New York City police officer.

Alicia Keys founded The Alicia Keys Foundation, an organization dedicated to addressing mass incarceration and other social justice issues, in 2003.

Lauryn Hill's album "The Miseducation of Lauryn Hill" included the song "Doo Wop (That Thing)" that addressed the issue of mass incarceration.

J. Cole's song "No Role Modelz" addresses the issue of mass incarceration and the criminal justice system, drawing on his own experiences with the justice system.

Kendrick Lamar's album "The Sun's Tirade" included the song "Alright" that became an anthem for the Black Lives Matter movement.

Meek Mill founded The Meek Mill Foundation, an organization dedicated to addressing mass incarceration and other social justice issues, in 2019.

Billie Holiday's song "Strange Fruit" addressed the issue of lynching and racial violence, and became a powerful anthem for the civil rights movement.

Common's song "I Used to Love H.E.R." addresses the issue of mass incarceration and the criminal justice system, drawing on his own experiences with the justice system.

Jay-Z's album "4:44" included the song "The Story of O.J." that addressed the issue of mass incarceration and racial injustice.