KKK stands for Knights of the Ku Klux Klan, a group of white, Christian supremists. Up until the late 60s the KKK was responsible for harassment and attacks against people of color or non-Christian religion. Members can be easily identified by the white robes they wear and a tall white mask, which looks like a ghost.
Mick hates blacks because his parents are in the KKK, he don't know better.
By musical orgasm I mean an experience in which one is moved by music to a level of consciousness which is characterized by feelings of ecstasy, omniscience, immortality, and sublime understanding. It does not, however, refer to a sexual thrill, nor is it characterized by emission of seminal fluid.