Boo Aka Boo Rosinni or Boo the Boss Player To true fans of good music the state of Mississippi is hallowed ground. It is the land where the blues, the basis of all forms of popular music started. It is, to some, an unlikely place for hip-hop let alone the next hip-hop superstar, but Mississippi native Boo is next big thing in rap music. Blessed with a liquid flow and a gift for telling gritty hardcore street narratives, Boo has been in the trenches of the Southern underground grinding.