Since no one else mentioned him, I'll have to say MF DOOM for one. Aside him, Tricky, Roots Manuva, Black Thought, Chali 2na mainly for the moment since my influences go by what I listen to in present time.
Big Pun
Prospect
Cuban Link
Armageddon
Diggin In The Crates
Nature
Nas
Xecutionerz
Quan
Scarface
Getoboys
Devin The Dude
Odd Squad
Mobb Deep
Eminem
D12
J Dilla
Slum Village
Jedi Mind Tricks
Wu Tang Clan
Method Man
Reakwon
Lord Superb
La Da Darkman
Kool G. Rap
Public Enemy
The Luniz
Black Thoughts
The Roots Crew
Royce Da Five Nine
AZ
The Fugees
Big L
Tupac
Outlaws
DMX
Jay Z
Foxy Brown
Notorious BIG
Lil Kim
Outkast
Lupe Fiasco
De La Soul
A Tibe Called Quest
I Self Devine
Lil Cease
Junior Mafia
Busta Rhymes
G Dep
Grave Diggas
Outsidaz
Rah Digga
Cage Kennelz
Stat Quo
Cannibal Ox
MF Doom
Kanye West
Common
Mos Def
Consequence
Talib Kweli
Sean Price
Buckshot
Heltah Skeletah
Craig Mack
Immortal Techinique
Cameron
Bleach Brothers
Mase
Original Gun Clappaz
Rockwilder
Pharoah Monche
Prince Poet
Madlib and Quasimoto
Danger Mouse
RDJ2
C Rayz Wallz
Black Milk
7L and Esoteric
Evidence aka Mr Slow Flow
Planet Asia
Serius Jones
Reed Dollaz
Joey Jihad
Hollowman
Ludacris and DTP
Field Mobb
Z RO
Trae
DJ Quik
Lil Wayne
Sqad
50 Cent (Power Of The Dollar)
Young Jeezy
Bun B
L L Cool J
Dipset
Cypress Hill
40 Glocc
Tha Game
The Clipse
Ab Liva
Sandman
Major figgas
Young Money
PSC
Lil John
T.I.
Ice Cube
MC Ren
Saigon
Nicki Minaj
Bone Thugs N Harmony
Twista
Mac Dre
C bo
Mac 10
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Don M.O.E.'s Right Hand
Too Short
Tha Product
Casual
Brand Nubian
Jurassic Five
Public Enemy, KRS-One, Rakim, The Rza, Eminem, MF Doom, Ras Kass, Proof, The Game, Xzibit, Kayne West, Talib Kweli, Mos Def, Aesop Rock, Nas, Heltah Skeltah, Common.....there are more but I don't want to bore you...