well I have 5091 J-rap songs in my ipod haha. Really cool that some people like J-rap.
From 2009, S.L.A.C.K has been the one of best rappers in Japan, I think.
YouTube - S.L.A.C.K. - NEXT (Produced by BUDAMUNKY)
Bron-K's 何ひとつうしなわず is 名曲。
YouTube - COWBOY BEBOP AMV - BRON-K 何ひとつうしなわず