As Dr. David Blackburn plays the piano, 7-year-old Catherine Mary Lee Williams rehearses with the Children’s Voices of Christmas choir Tuesday night at the Margaret Martin Performing Arts Center in Natchez. Williams will be joined by more than 60 other children from the MIss-Lou to be a part of the Natchez Opera Christmas musical &uot;Gift of the Magi&uot; Thursday, Dec. 14, and Saturday, Dec. 16.