NIGERIAN MUSICIANS CATEGORIZED INTO A-E LIST (2000-2019).
A List Artists
2Baba, Wizkid, Davido, Olamide, Dbanj, Psquare, BankyW, Asa, MI Abaga, Timaya, Tiwa Savage, Yemi Alade, Wande Coal, Darey Art Alade, Timi Dakolo, Phyno, Flavour, 9ice.

B List Artists
Reekado Banks, Vector, Kiss Daniel, Tekno, Patoranking, Runtown, Burnaboy, Maleek Berry, Seyi Shay, Simi, Iyanya, Illbliss, LilKesh, Falz, Niyiola, Adekunle Gold, Ycee, Reminisce, Mr Eazi, Harrysongs, Dr Sid, Terry G.

C List Artists
Dremo, Koker, CDQ, Eva Alordiah, Mayorkun, Ice prince, Skales, Lax, Sugarboy, Kcee, Yung6ix, Niniola, DammyKrane, Dprince, Korede Bello, Humble Smith, Sean Tizzle, Naira Marley, Rema, Zlatan, Teni, Oritsefemi, Orezi.

D List Artists
Dotman, Dija, Pepenazi, Chinko Ekun, Viktoh, Ric Hassani, Kayswitch, Terry Apala, Oladips, Small Doctor, Skiibii, Flex B, MZ Kiss, POE, Rayce, Chyn, Seriki, B-red.

E List Artists
Temmie Ovwasa, Ceaser, Ichaba, Milli, Erigga, Superwozzy, Kidakudz, Davolee, Tjan.

Nice but not complete

You forgot to add Xpol or it's omission.. Check one of his songs here. http://www.naijapals.com/music/Searching_for_love_Xpol-89179