This list speaks for itself. To all you hip-hoppers, past and present, list all your favorite groups of all time. Here's mine:

1. Run-DMC
2. Public Enemy
3. N.W.A.
4. Whodini
5. Eric B. & Rakim
6. Outkast
7. Heavy D. & The Boyz
8. Salt & Pepa
9. Digital Underground
10. DJ Jazzy Jeff & The Fresh Prince
11. EPMD
12. 2 Live Crew
13. Grandmaster Flash & the Furious Five
14. Boogie Down Productions
15. Geto Boys
16. The Fat Boys
17. The Beastie Boys
18. U.T.F.O
19. Wu-Tang Clan
20. Naughty By Nature

Biggie
2Pac
Dr. Dre
Nas
Eminem
Snoop
Rakim
Flo Rider
Cypress Hill
Naughty By Nature
E-40
Notes To Self
Wu Tang

Red said:

I said groups man! Are you slow or what? Pac, Dre, and Biggie are solo artists not groups.

20 is too many to list, so i'll do my top 10:

1. Public Enemy
2. Wu Tang Clan
3. A Tribe Called Quest
4. Eric B. & Rakim
5. Gang Starr
6. Pete Rock & C.L. Smooth
7. EPMD
8. Outkast
9. Salt n Pepa
10. BDP

LoDog said:

My list would have Public Enemy at #1, NWA at #2, and RUN DMC at #3. But I agree with everything else.

fearless 4
Disco 4
Treacherous 3
Crash crew
Cold crush brothers
Jazzy 5
Soul Sonic force
Mean Machine
Funky 4 +1
Flash & the 5
Public Enemy
Run Dmc
Blacksheep
De La soul
Main Source
Smiff N Wessun
Blackmoon
Organized Confuzion
Jurassic 5
Camp Lo

LoDog said:

1st of all Red's a chick and was in the industry probably before you were born.

Tupac and THe Outlawz
NWA
DMX
Lil Wayne

Outkast
PE
Run DMC
Dr Dre and Snoop
Cyress Hill
Fugees
Soul Sonic Force
Goodie Mob
Salt & Pepa
Digital Underground
Geto Boys
Beastie Boys
Whodini
Naughty By Nature
NWA
Wu-tang
Fresh Prince
Delasoul
Grand Master Flash
The Roots