I remember a time when Eminem was going to retire, then came back and we were waiting, waiting and waiting some more for the new Em project. Well, looks like Dr. Dre is pushing back Detox again.

Eminem turned to Dr. Dre to help him get out of his funk when the two hit the studio to work on the Detroit lyricist's post-hiatus comeback LP, Relapse. Now, it looks like the tables have turned.

On Dre's "I Need a Doctor" — the second leak in as many days from the producer's long-awaited Detox — Em lowers the boom on his mentor saying his "perfectionist" rep is leaving the legend stuck in the mud.

"It hurts when I see you struggle/ You come to me with ideas/ You say they're pieces, so I'm puzzled," Eminem raps over the Alex da Kid produced-number. " 'Cause the sh-- I hear is crazy/ But you're either getting lazy/ Or don't believe in you no more/ Seem like your own opinion is not one you can form/ Can't make a decision/ You keep questioning yourself, second guessing, it's almost like you're begging for my help/ Like I'm your leader, you're supposed to be my mentor/ I can endure no more/ Don't you remember who you are."

via Dr. Dre, Eminem's 'I Need A Doctor' Hits The Net - Music, Celebrity, Artist News | MTV.