NEW : 38 Special is the 8th act to announce a SeaWorld cancellation . Martina McBride cites `` all the issues that have been aired recently '' in her announcement . Willie Nelson , Trisha Yearwood , Cheap Trick , others already canceled . Online campaign asks acts to ditch SeaWorld after airing of `` Blackfish .
NEW : 38 Special is the 8th act to announce a SeaWorld cancellation . Martina McBride cites `` all the issues that have been aired recently '' in her announcement . Trisha Yearwood , Willie Nelson , Cheap Trick , others already canceled . Online campaign asks acts to ditch SeaWorld after airing of `` Blackfish '' film .