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CHICAGO — Chief Keef is known for many things in the city of Chicago. He’s a rapper with a rap sheet from Englewood who rose to fame for releasing music that most parents would consider too explicit for young ears.

A substitute teacher at John Fiske Elementary School thought differently, however, and decided to devote an entire lesson plan to educating her sixth grade students on all things Chief Keef.

The woman instructed her class of sixth-graders to research the controversial rapper and learn key information about him, including when the rapper was placed on house arrest and who shot him when he was 16, according to the Chicago Sun-Times.

When Katrina Sanders found out her son was being required to listen to music filled with inappropriate references and anti-police sentiments, she took to YouTube to express her outrage.

“What happened to the musical composers? The music that this teacher is presenting is the very thing that the children don’t need: profanity, drugs and acting as if being arrested is a badge of honor,” Sanders said.

A spokeswoman for the Chicago Public Schools said Fiske’s principal was unaware of the substitute teacher’s actions, but Sanders says she had complained to staff members for weeks and her concerns were never relayed to administration.

“This inappropriate project was immediately suspended by the principal as soon as she learned about it,” spokeswoman Emily Bittner said in statement. “While teachers have flexibility in making assignments, CPS requires them to provide age-appropriate material in the classroom.”

Sanders says the principal’s lack of oversight is costly to the students and is upset that her son had to be exposed to such tasteless music.