Mumble rap – the most recent art form of rapping – or arguably the art of not rapping. Rather than rapping clearly, eloquently, articulately and with prowess and esteem, mumble rappers string occasional words together, like “cat”, “sat” and if you’re lucky, “mat”. And mumble rappers tend to do just that, they mumble. (https://theconversation.com/mumble-rap-cultural-laziness-or-a-true-reflection-of-contemporary-times-85550)
New Wave Rap 