Three Six Mafi-uh! Been listening to them way back in the 2000's. They've been around since '94 dropping their first Album entitled "Smoked Out, Loced Out (1994)".
The image below is taken from their album "Mystic Stylez" released in May 25th, 1995 couple of months before I was born.
Their genres are: Horrorcore, Gangsta Rap, Trap, Crunk, Dirty South, etc.
It's believed they were HUGE influencers of the new-school rap, trap and hip-hop culture, for example $uicideboy$ just like
@sousage showed us are deeply influenced by this group.
Click on the image for y'all to listen my favorite song from the 3 6.
R.I.P. LORD INFAMOUS
R.I.P. KOOPSTA KNICCA