The argument that all music originated from blacks is just typical white guilt bullshit.
Classical and medieval music anyone? All blacks did was grab some white-made instruments laying around and aimlessly bang on them for whitey's amusement for a handfull of decades. Nowadays all blacks do in the field of 'music' is rap and little else, but all is pure shit.
whitey, on the other hand, developed a whole parafenalia of genres, opera, classical, rock, metal, punk, neoclassical, electronic, techno, pop, i could go on and on.
All this attempt to make blacks feel good about themselves for creating something is nothing more than preposterous and a side-effect of white guilt.