“You Don’t Know” is the lead single from the Shady Records compilation album Eminem Presents: The Re-Up. The song is performed by Eminem featuring former Shady Records artists 50 Cent, and Lloyd Banks, and features the new vocals from Ca$his. The song is produced by Eminem and legendary Luis Resto.
“You Don’t Know” was released in the UK on December 11, 2006. It managed to chart from download sales alone, peaking at #32. in US, the song peaked at #12 on the Billboard Hot 100, becoming the highest debut for a single on this chart for 50 Cent, Lloyd Banks, and Ca$his. It was Eminem’s fifth highest debut, after “We Made You”, at number 9, “Forever”, with Drake, Kanye West, and Lil Wayne, at number 8, “Love the Way You Lie”, with Rihanna, at number 2, and “Not Afraid”, which became the sixteenth overall and second rap song to debut at number 1. The song is featured in the WWE film The Condemned. This song is also used by the Boston Celtics for their player introductions at the TD Garden.
The song was also commercially successful in Ireland and Norway, peaking at number 5 and number 7, respectively.
The song received positive reviews from critics. AllMusic called this song “the excellent all-star single. The Guardian thought that Eminem lost creativity but the song was praised.