 It may be the end of the road for actor Jack Black's side project. Actor Jack Black shutting down his long-running musical act Tenacious D. This is not the greatest song in the world. 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. Black said he's grateful for the fans for their support.