Pre 90's Stetsasonic - Stet Troop '88
Stetsasonic - DBC Let the Music Play
Three Times Dope - Funky Dividends. They're supposed to be legends, but generally unknown (influential in Philly tho)
De La Soul - Ghetto Thang
Big Daddy Kane - Ain't No Half Steppin'
Def Jef - Droppin' Rhymes on Drums
Gang Starr - No More Mr. Nice Guy
Utmost old school
Kurtis Blow - If I Ruled the World
Kurtis Blow - 8 Million Stories
Afrika Bambaataa - Planet Rock
Whodini - Friends
Ron Hunt - Spider Rap
Added (04/Mar/11, 4:07 PM)
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Also, I feel obligated to add Kool Moe Dee..
Go See the Doctooor!