Another example of this nasal yelling/spaz-out style = Danny Brown, on some tunes. Sometimes I like it when he does this but I definitely prefer it when he reigns himself in a bit. I dunno, maybe not even talking about that kanye-style now, although it does still remind me of Wayne.
Almost seems a fitting style to become generic in an age of ceaseless noise (the 'age of information') - it always sounds like the rapper is trying to make themselves heard, makes themselves seem special (ironically only making themselves seem more generic and trend-bound) etc. Again I think of Kanye, the hype he creates around his releases (the ''Good Friday'' thing, this ''Watch The Throne'' hype)... and Drake, another Young Money associate, the way he talks so much about his own monumentality...
Maybe this is just always the case in rap music.
Most mixtapes I listen to at the moment (while a lot of them are great) are almost obnoxiously loud, busy and cluttered. Constant self-hyping ad-libs, DJ jingles/rewinds, the production erring towards Lex-style grenade bass and chittering hi-hats. On the other hand, I suppose you could say that a lot of Lex-style tunes are actually very stripped back, even economical...
Interesting thing about Waka/Gucci on 'Ferrari Boyz', for example, is that although they are often aggressive/shouty rappers, they're also often quite lethargic sounding. I dunno, when I hear - say - Meek Mill over a big trap beat, it sort of makes sense because he's drawing on the internal pandemonium of the beat, but on the other hand I almost feel like you don't NEED someone screaming at a rapid pace over a beat that's ALREADY screaming.
''Thinking'' out loud here, apologies.