A$AP
Aaliyah (not really a rapper)
AB-Soul
Aesop Rock
Anilyst
Asher Roth
Big Boi
Big K.R.I.T.
Big L
Big Pun
Big Sean
Bizarre
Black Haze
Black Eyed Peas group (Where is the Love)
Back Moon group
Blaq Poet
Capone-N-Noreaga
Common
Cypress Hill
D12
Danny Brown
Devlin
Devin Tha Dude
Dizi Johnson
DMX
Dr Dre
Drake
Earl Sweatshirt
Eazy E
Ed Sheeran (kinda raps in "You Need Me I don't Need You)
Eminem
Game
Ghostface Killah
Grieves
Herb McGruff
Hopsin
Immortal Technique
Jadakiss
Jay Rock
Jay-Z
Joshua Gunn
Kanye West
kendrick Lamar
Kid Cudi
Kool G Rap
King Bee
Krizz Kaliko
L.O.X.
Labrinth
Lil Wayne (sadly, only have Drop the World ft. Eminem)
Lonely Island??
Lupe Fiasco
MGK
Mario?
Mobb Deep
Mike Mictlan
Nas
Notorious BIG
O.C.
OFWGKTA group
Onyx
Papoose
P.O.S.
Phonte
Phora
Proof
Public Enemy
Pusha T
R.Kelly
Raekwon
Rakim
Reks
Ron Browz
Roots Manuva
Roy Jones Jr
Royce Da 5'9"
Run DMC
Sage Francis
Scarface
Shyheim
Slick Rick
Snak The Ripper
Snoop Dogg
Soul Khan
Sticky Fingaz
Tech N9ne
Trae tha Truth
A Tribe Called Quest
Trick Trick
Tyler The Creator
Twista
Vinnie Paz
The Welfare Poets
Wu-Tang Clan
WWE
Xzibit
2Pac
50 Cent
And many, many more on my iPad.
Guy above me two times has a very similar list - good music taste

And the guy below me...