From www.wdwinfo.com

Trace Adkins cancels SeaWorld performance
Jan 12, 2014

Trace Adkins is the ninth musical act to cancel an upcoming performance at SeaWorld's Bands, Brew and BBQ event. Eight other groups canceled in December, citing their fans' displeasure with Blackfish, the anti-SeaWorld documentary. Adkins' reason is slightly different than the previous bands. A statement from his representative said, "Trace prefers that the focus of his performances be on music, not on controversy. Therefore, he has decided not to proceed with this show in the midst of this debate."

SeaWorld says all the bands will be replaced, but they will not be announcing the replacements until the full schedule has been secured.