A few major artists missed out:
Black Moon - How Many MCs/Who Got Da Props
Junior M.A.F.I.A. - Lyrical Wizadry/Murder Onze
Bone Thugs-N-Harmony - Down '71/1st of Tha Month
Cypress Hill - Pigs/Hand on the Pump
Big L - Flamboyant/Ebonics
Main Source - Looking At The Front Door/Live @ The BBQ
Jurassic 5 - Great Expectations/A Day At The Races
EPMD - Strictly Business/You Gots To Chill
Binary Star - Conquistadors/Slang Blade
Cormega - Fallen Soldiers/Verbal Graffiti
Snoop Dogg - Tha Shiznit/Murder Was The Case
Boogie Down Productions - I'm Still #1/T'Cha T'Cha
Gravediggaz - Diary of a Madman/From the Dark Side
Capone-N-Noreaga - Illegal Life/Halfway Thugs
And I know these guys have already been mentioned, but essential tracks all the same:
Smif 'N' Wessun - Wontime
Wu-Tang Clan - Da Mystery of Chessboxin'
Biggie - Machine Gun Funk
Ice-T - Bitches
De La Soul - Held Down
A Tribe Called Quest - Jazz (We've Got)
Atmosphere - God's Bathroom Floor
Cannibal Ox - Iron Galaxy
GZA - I Gotcha Back
Company Flow - 8 Steps To Perfection
Mobb Deep - Give Up The Goods
jay-z - 22 twos
wu tang clan - protect ya neck, triumph
fugees - ready or not, family business
nas - ny state of mind
outkast - players ball
2pac - hail mary
snoop & dre - deep cover
method man - bring the pain
biggie - ready to die
ol dirty bastard - brooklyn zoo
geto boys - damn it feels good to be a gangsta