That's why we, sing for these kids who don't have a thing
Except for a dream and a fucking rap magazine
Who post pin-up pictures on they walls all day long
Idolize they favorite rappers and know all they songs

from Eminem – Sing for the Moment Lyrics on Rap Genius

Meaning

Eminem targets kids who have difficult childhoods like him and who use rap to escape from their troubles. Since Eminem found solace in dark times by listening to his favorite artists when he was a kid, he hopes to be able to do the same for this generation through his music.

The whole section pays homage to The Notorious B.I.G. and his song “Juicy” where Biggie raps about his difficult childhood and how his only escapes from his rough upbringing were reading rap magazines and hanging up posters. To Biggie, becoming a rapper was all but a dream.

This speaks to the cyclical nature of influence in hip-hop. Eminem was influenced by Biggie when he was younger, and now his music is going to influence the next generation of rappers just like how older rappers like Big influenced him.

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