Not quite as good as his previous musical efforts, but hey...unlike Mittens, at least he's trying!
But back to the main point, there was a Blues Concert last night at the White House:
And Michelle doing her bit:
Update: Feb. 22, 2012, 2:51pm: My bad. It wasn't B.B. who challenged the President to sing. (He was seated in the glitter jacket, with Lucille on his lap). It was Buddy Guy.