Where have you been living, comrade? When did American black culture "jump the shark"? IMO it is just now starting to hit it's stride. Of course it wasn't doing very well decades ago when it really wasn't a whole lot of fun to be black in this country, and much of their original culture had been wiped out and replaced with "our" "whitebread" christianity. Nowadays there are many many young white kids out there that are doing everything they can to 'be' black, and not a pale Bill Cosby/Wayne Brady shade of black either.
Oh, and don't forget rock(and roll). There are relatively few black rock musicians, but the whole genre wouldn't exist if it weren't for white people co-opting all of the ground work that was laid as blues, jazz, etc.
