Singer Rhiannon Giddens taps America's deep musical roots
Watch Video | Listen to the AudioRELATED LINKSRhiannon Giddens performs 'Julie,' a song inspired by a slave's story Big Ears Festival breaks barriers for open-minded music lovers Carolina Chocolate Drops' Sweet Old-time Sound JUDY WOODRUFF: Finally tonight: a singer celebrating American roots. At the White House last night, Rhiannon Giddens performed in a concert honoring the history of gospel music. And that’…