Have been a rarity for the most part. Hendrix, Funkadelic and Mother's Finest (and early rockers like Chuck Berry etc...) are some of the few I have been familiar with. On a whim I discovered this article:
http://www.spin.com/articles/black-rock-oral-history
And in it some interesting artists.
Please add to the list!
...'mixed' groups are fine too.
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