12 and 16 Waverly Alford – guest vocals on track 13 Shaphan Williams – additional keyboards on track 13 David Willis – producer on track 14 Jude Angelini – guest vocals on track 15 Salam Nassar – producer on track 15 and recorder on track 19 Obie Trice – guest vocals on track 16 Jimmy Hill - guest vocals on track 16 and co recorder Nathaniel Hale – guest vocals on track 17 Brandon "Dirty Bird" Parrott – producer on track 17 Denaun Porter – producer and guest vocals on track 19 Chart history References 2005 albums Proof (rapper) albums Albums produced by Ski Beatz Albums produced by Black Milk Albums produced by Mr. Porter Albums produced by Nick Speed Albums produced by Emile Haynie Albums produced by Fredwreck Albums produced by Eminem