Nickatina & Nick Peace
Dre Dog & T.C.
Murs & 9th Wonder
Madvillainy (Doom & Madlib) or Doom & himself
Mac Dre & Khayree
Jacka & Rob Lo
Mista Cane & EQ
GZA & RZA
Cage & Necro even though its never gonna happen again
Copywrite & RJD2
7L & Esoteric
MC Zion and Amp Live (Zion I)
Phonte and Nicolay (foreign exchange)
Phonte and 9th wonder
Sage Francis and Joey Beats (non-prophets)
Vinnie Paz and Stoupe (Jedi Mind)
A-Wax and Lev Berlak
Aceyalone and Josef Leimberg
Trae and Q-stone
Pep Love and A-Plus
Talib Kweli and Hi-Tek
Buckshot and Evil Dee or Evil Dee & Mr. Walt
Tupac and Johnny J
Outkast and Organized Noise
Freddy Foxxx and Pete Rock
Guru and Primo
Brotha Lynch Hung and Phonk Beta
Spice 1 and Ant Banks
GZA and RZA
Tone Capone/3X Krazy
Studio Tone/E-40
First Degree/First Degree
Lynch & Beta/Siccmade
Khayree/Mac Dre
NBD/Mo Love
Agerman/DJ Daryl (only song was the Sparkin Flames from Agerman first shit, but it slapped hard)
and many many more...