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1. Old School - Grandmaster Flash, Grandmaster Caz, MC Lyte, Boogie Down Productions, Slick Rick, Biz Markee
2. Boom Bap - Gangstarr, Big L, Nas, Show & A.G., Apathy, Group Home, MF Doom
3. G Funk - Warren G, Nate Dogg, Bad Azz, Snoop Dogg, The Dove Shack
4. Hyphy - Keak Da Sneak, E-40, The Pack, Mac Dre, Turf Talk, The Federation
5. Crunk - Lil Jon, David Banner, Pastor Troy, Ying Yang Twins
6. Bay Area/Mobb Music - Rich the Factor, Too $hort, JT the Bigga Figga, San Quinn, Loony Coleone, Mac Mall
7. Old Kanye - Kanye West first 3 albums
8. New Kanye - Kanye West "Yeezus" album
9. Jay-Z - Jay-Z's The Dynasty album era Jay-Z
10. Neptunes - Anything Pharrell Williams sang a hook/made a beat on in the late 90s, early 2000s. Jay-Z songs, Justin Timberlake songs etc.
11. Eminem (On drugs) - The Slim Shady EP/LP, The Marshall Mathers LP
12. Rap Rock - hed P.E., Limp Bizkit, Korn
13. U.K. Grime - Skepta, Stormzy, Dizzee Rascal, Wiley
14. Mumble Rap - Young Thug, 21 Savage, Future
15. Miami Trap - Rick Ross, Brisco, Gunplay, Ace Hood
16. Reggae - Wikipedia reggae and start there
17. NYC Jazz Rap - A Tribe Called Quest, De La Soul, Native Tongues
18. West Coast Underground - Hieroglyphics, Living Legends, Project Blowed
19. Horrorcore/Juggalo - Twiztid, ICP, Young Wicked
20. Houston Slab Music - Z-Ro, Trae, Slim Thug, Lil Keke, Paul Wall, U.G.K., Big KRIT
21. Club - I don't know any specific artists who regularly do this, it's just a lame trend rappers do when they don't stop rhyming the word club.
22. Drake - Every Drake project has him singing about his mom in a questionable manner
23. Reggaeton - Daddy Yankee, Don Omar, J Balvin
24. Wu-Tang - Ghostface Killah, Action Bronson, Raekwon, Gravediggaz
25. Chopped & Screwed - Any Houston slab music slowed down
26. Memphis Rap - Three 6 Mafia, Gangsta Boo, Juicy J
27. Midwest Chopper - Tech N9ne, J.L., Ces Cru, Godemis
28. Dipset - Cam'Ron, Juelz Santana, Hell Rell