First, it was Willie  Nelson. Then it was Trisha  Yearwood. Now, Martina McBride is  dropping out of her planned appearance at SeaWorld following a rash of bad  publicity surrounding the marine mammal theme park as a result of the  documentary ‘Blackfish.’ The doc chronicles life in captivity for Tilikum, the whale that killed its  trainer a few … More Martina McBride Drops Out of SeaWorld Gig, Cites ‘Issues’