My friend Esther of Esther and Freddy fame sent me this story - Sweet Honey in the Rock at the Whitehouse performing for a group of middle schoolers Michelle Obama had invited over for a Black History Month program. You know what she said has got to motivate them. And hearing Sweet Honey...! That changed my life and I didn't hear them until I was like twenty. If you haven't heard them yet here's a few pickings from U-Tube:
The classic "We Who Believe in Freedom" (quoted in the book)
A performance in Sydney, Australia here
And the more musically intricate "Peace"
And here's their official site, with tour dates and so on.