TAMPA (CBSMiami/AP) — After nine musical acts pulled out of performing at SeaWorld Orlando, the cancellations have spread to its sister park, Busch Gardens.

A spokesman said Thursday that Pat Benatar and the Beach Boys have canceled their upcoming appearances at Busch Gardens in Tampa in the wake of a documentary critical of how animals are kept in captivity at SeaWorld’s marine parks.

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The performers had been slated to perform at Busch Garden’s Bands, Brew & BBQ concert series which starts next month.

Nine recording artists have backed out of performing at a similar concert series at SeaWorld Orlando next month. They include country singers Trace Adkins, Martina McBride, Trisha Yearwood, as well as rock performers Heart, 38 Special and Barenaked Ladies.

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SeaWorld posted ads last month in a handful of newspapers around the nation after the acts pulled out of performing.

The documentary “Blackfish” explores what may have caused a 12,000-pound orca named Tilikum to kill veteran SeaWorld trainer Dawn Brancheau in 2010.

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