Replacing the doctor cause Dre couldn't make it today
He's a little under the weather, so I'm taking his place
Eminem is “taking his (Dr. Dre) place” on the song in terms of production.
It’s well known that Dr. Dre does much of the production for Eminem, however this song, along with a couple other tracks on the CD, were produced by Eminem along with the Bass Brothers, thus the replacement reference.
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