Artists with more than one classic album...

[dpgc2002]

Dr. Dre
Nas
Pac
Biggie
Outkast
Gangstarr
Bone Thugs
Mobb Deep

I can't think of anymore...

[Mad-Pac]

I agree with that with the addition of DJ Quik

[tnp]

Ice Cube!
2 classic solos (Amerikkkas Most Wanted, Death Certificate)
2 classic group albums (Straight Outta Compton, Bow Down)
1 classic EP (Kill at Will)

[Twentytwofifty]

If you're talking about absolute hip-hop classics, then this is it

Rakim
KRS-One
A Tribe Called Quest
Run D.M.C.

Just normal classics add:

Big Daddy Kane, Public Enemy, Dr. Dre, Outkast, Nas, Mobb Deep, NWA, 2Pac, De La Soul, Scarface, Gang Starr, Ice Cube, Notorious B.I.G., EPMD & Jay-Z (like it or not Blueprint will be considered a classic)

[min0rity]

pac
dj quik

[LAZY]

Above The Law (Blakc Mafia Life, Uncle Sams Curse)
Ice Cube (exactly wut tnp said)
Dr. Dre (the chronic, 2001)
NWA (IMO both there LPs)
Eazy-E (Eaz-Duz-It, Its On EP)
2pac (all eyez on me, 7 day theory)
bone thugs (creepin ep, e 1999)

[CharlieBrown]

Dilated Peoples (and they've only released 2!)

[Woodrow]

I'm gonna say Quik, but Im biased a little bit

Gotta go with cube... Amerikkkaz most wanted and then he followed that up with death certificate... Man, back then he could do no wrong musically.

[Gangsta_T]

more than one classic

ICE CUBE no doubt
Too Short
Spice 1
Ice-T
Gangstarr
A Tribe called Quest

[Kill]

all those mentioned above plus also

The Roots
Big L (in my personal oppinion)
Jeru The Damaja (his 1st 2)
De La Soul
Ras Kass

alot of people would also say Eminem

[Ben .k.]

2pac
Dj Quik
Dr.Dre
warren g
bone thugs
outkast
naughty by nature
scarface
yukmouth

[Don Seer]

warren only got one...

i'd say wu-tang do.. and i actually prefer "Forever"

Above The Law got 3... their first is classic too

hopefully deuce will jump the DOC up to two.. but think it will be slept on

[Native_Joe99]

no one mentioned snoop dogg, i would think doggystyle, or Top Dogg, or Last Meal. or some shit like that. Plus E-40 is on some tight shit, underated tho. Eazy-E - Quik, gotta give props for them. 2pac ture hip hop classic, few more already been mentioned.

[Dedicato]

Snoop ONLY Doggystyle ...

BUt Pac, Dre, Rakim, Cube, ATL got more than 1

[Twentytwofifty]

hopefully deuce will jump the DOC up to two.. but think it will be slept on

Probably not, unless he makes it with lots of guest spots like 2001 but not as much mic time as Dre had.  His voice is too fucked.  Helter Skelter made me feel real sorry for him.  He sounds terrible.