I think rap has been and always will be a singles medium. It just doesn't work well in an album format. Not that there's anything wrong with that. Rap is really hit or miss but when it hits, like say, Pras "Ghetto Superstar," it's fantastic.
To quote Eddie Murphy in an old SNL skit:
Michael Jackson: "Nine of out ten times, I get my face slapped, but that tenth one: it's magic. It's wonderful."
The greatest rap album I've ever heard?
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I know it's not "true rap", it's very nostalgic (a sin) and it's more "mall rap" but there's some great singles on there.
1. White Lines (Don't Don't Do It) - Grandmaster Flash, Grandmaster Melle Mel
2. Walk This Way - Run-D.M.C.
3. Funky Cold Medina - Tone-Loc
4. Humpty Dance - Digital Underground
5. Bust a Move - Young MC
6. It Takes Two - Rob Base & DJ E-Z Rock
7. U Can't Touch This - MC Hammer
8. Parents Just Don't Understand - DJ Jazzy Jeff & the Fresh Prince
9. Around the Way Girl - LL Cool J
10. Set Adrift on Memory Bliss - P.M. Dawn
11. Tennessee - Arrested Development
12. Now That We Found Love - Heavy D & the Boyz
13. Good Vibrations - Marky Mark and the Funky Bunch
14. Baby Got Back - Sir Mix-A-Lot
15. Jump Around - House of Pain
16. Hip Hop Hooray - Naughty by Nature
17. Who Am I (What's My Name)? - Snoop Dogg
18. Nuthin' But a "G" Thang - Dr. Dre, Snoop Dogg