Charismatic German/Ghanian MC Serious Klein releases haunting new single "91 Flex" (Majestic Casual) Stream: https://soundcloud.com/seritheking/boyboy Buy / Stream: https://SeriousKlein.lnk.to/91Flex View COLORS session https://youtu.be/nV883rnogtM Germany-based, Ghanian rapper Serious…