N.E.R.D stands for No One Ever Really Dies. It's our life. N.E.R.D is just a basic belief. People's energies are made of their souls. When you die, that energy may disperse but it isn't destroyed. Energy cannot be destroyed. It can manifest in a different way but even then it's like their souls are going somewhere. If it's going to heaven or hell or even if it's going into a fog or somewhere in the atmosphere to lurk unbeknownst to itself, it's going somewhere." --- Pharrell Williams
Thats from the man himself
Its a sprirtual thing.. The music is "mind music"