Doesn't matter but Tyler doesn't listen to underground or horrorcore, he's admitted he tried to but found he didn't like the music
the closes he listens to that's underground from his admition is MF Doom
Earl Sweatshirt on the other hand listens to Eminem, so I guess you can list him as that horrorcore influence
but why does somebody have had to listen Tech N9ne or any other horrorcore artist to say cruel and evil shit ? teenagers talk about death and murder shit all the time and are most likely to slap sum Wiz Khalifa or Waka Flocka over Tech and Hopsin
and B.O.B's mainstream break was as a clean rapper, so despite however he was in the underground, him trying to sound hard is just weird to listen to