The Irish band "Celtic Woman" is in the midst of a 90 concert tour that makes stops in 75 cities across the United States, including a concert at the Hippodrome Theater in Baltimore on Tuesday night. Their latest album and DVD, "Emerald: Musical Gems," toppped the Billboard World Music Charts. Tom Hall talks with violinist Máiréad Nesbitt and soprano Lynn Hilary, two of the four members of Celtic Woman.