And I think it's unduly restrictive in each case. Most (but far from all) jazz musicians are black and most (but far from all) physicists are white; that doesn't make jazz "black" music any more than it makes physics "white" science. Only in the sense that jazz originated in Southern black culture and entered a renaissance in Northern black culture after the turn of the 20th century is the term valid, but it's moved far beyond that now, a fact we should recognize and celebrate. The days when it was born and matured were days when it WAS nearly exclusively black music because its country or origin was officially segregated in the South and unofficially in the North. America, and jazz, have grown beyond that, to the credit of both. Ignoring the political reality, the musical reality is that jazz is both too widely accessible and too influential in other musical genres to be so narrowly defined.