S.L.A.C.K. has been played on NTS in shows including Slime w/ Little, featured first on 1 April 2018. Songs played include Sitt, Girl If You and Girl If You.

S.L.A.C.K. is a japanese rapper and track maker out of Itabashi-ku, Tokyo, and younger brother to PUNPEE. He is a part of the groups PSG, Sick Team, and Down North Camp.

As of 2012, His name has been changed to 5LACK.