Renée Fleming's 'American Voices' festival transcends disappointing concert

This weekend, I had a couple of the most enjoyable days I've ever spent at the Kennedy Center. I watched jazz singer Dianne Reeves guide a high school senior's transformation from obedient schoolgirl into freewheeling jazz artist in about 10 minutes flat. I was a fly on the wall as the old-school rock artists' manager who created Metallica sparred verbally with the man who helps create pop hits by putting songs in video games. And I saw futuristic images of lasers erasing a bleeding capillary on...