I been listening to band named Crotchduster and all they do is make fun of band and metal genres but their good and I like and at the same time their funny as hell.
The that has affected me most throughout the years would have to be Pink Floyd - On the Turning Away. Roger Waters tries to get people to help their fellow man instead of ignoring people in need. I tend to be very helpful to those in need however I can and this song put into perspective what needs to happen to make this world a better place. I listen to this song and it makes me sad that most people will never understand what he is trying to convey to everyone. This song describes adequately how I truly feel inside and what I wish people would do.
It's a sub category of brutal death metal. I don't how to explain it exactly so my best suggestion would be to listen to some bands and hear the differences. Abominable Putridity is one, also Big End Bolt and Devourment.
A good example of a joke band would be Crotchduster, they combine many genres including metalcore into one song and their honestly good at what they do.