Brilliant black musician, once promising disappears in a vortex of drugs alcohol, public expectation and the dark side of his or her own genius. I thought of my first sentence not because of Sly Stone, Albert Ayler, Rick James, Sam Cooke, Jimi Hendrix, Johnny Hartman, and Billie Holiday, but because of D’Angelo. In an uncharacteristically poignant article in the August issue of Spin, the magazine tried to track down the artist, a man who all but disappeared from the pop universe only years after