 Hollywood. Could this be the end of the road for actor Jack Black's long-running side project? Actor Jack Black shutting down his long-running musical act, Tenacious D. Black's partner, Kyle Gass, made an off-color joke about the attempted assassination of former President Trump during a show in Australia. Jack Black now says the tour is on hold and he is rethinking working with Gass, who has also apologized. Sherry Preston, ABC News. 4.27 now.