BLK JKS (pronounced Black Jacks) are a South African rock band from Johannesburg, formed in Contents. [hide]. 1 Discography. Albums; EPs; Discography · Albums · References · External links. b-abba.eu The BlackJacks are the new bad boys of Vegas. This is a rock band that. With an experimental sound that fuses jazz, funk, and rock, South African quartet BLK JKS (pronounced " Black.