Early Hip-hop, from its initial popularization to Gangsta Rap
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Early Hip-hop

1. Afrika Bambaataa and the Soul Sonic Force Planet Rock, sampling pioneering German electronica/pre-new-wave band Kraftwerk (1982)
2. Grandmaster Flash’s The Message (Live 1983)

   Top 40 Rap, 1983-1988

3. Run D.M.C.’s It’s Like That (1983)
4. The Beastie Boys’ Cooky Puss[includes statements of violence and hate] (1983)
5. Marley Marl’s Marley Marl Scratch (1985)
6. Salt-N-Pepa’s Tramp (1985)
7. Run D.M.C.’s It’s Tricky (1986)
8. D.J. Jazzy Jeff and the Fresh Prince: Parents Just Don’t Understand (1988)
   
   
9. Public Enemy’s PETV’s Brown Bags Documentary / Night of the Living Baseheads (1987)
10. Public Enemy’s Fight the Power (1988)
    
    

    Early Gangsta Rap

11. N.W.A.’s Straight Outta Compton [includes statements of violence and hate] (1988)
12. Ice Cube Today Was A Good Day (1994)
    

    
    
    

    In case of your curiosity:

13. Afrikaa Bambaataa (2005 interview) on the The 5th Element.