"Tenacious D in The Pick of Destiny" was not canceled; rather, it was released in theaters on November 22, 2006. However, it did not perform well at the box office, grossing only about $13 million against a budget of $20 million. Despite its initial commercial failure, the film gained a cult following over the years, appreciated for its humor, music, and performances by Jack Black and Kyle Gass. The film's unique blend of rock music and comedy has solidified its status among fans, but it did not lead to further major film projects for the duo.

As of October 2023, "Tenacious D in The Pick of Destiny" is not available on Netflix. Streaming availability can change frequently, so it's a good idea to check the platform directly for the most current information. You might also find the film on other platforms such as Amazon Prime Video, Hulu, or for rental on services like Google Play or Apple TV.

Yes, Dave Grohl sings in "Tenacious D in The Pick of Destiny." He portrays the character of Satan and performs the song "Beelzeboss (The Final Showdown)" during a climactic battle with Tenacious D, played by Jack Black and Kyle Gass. Grohl's energetic performance and vocal prowess contribute significantly to the film's musical elements, showcasing his talents beyond his role as a drummer and frontman in rock bands like Nirvana and Foo Fighters.

"Tenacious D in The Pick of Destiny" is not appropriate for kids. The film features strong language, sexual content, drug use, and themes that may not be suitable for younger audiences. It is rated R, which indicates that it contains adult material. While it is a comedy with musical elements, its humor and content are geared towards an older audience, particularly fans of Tenacious D. Parents should consider these factors before allowing children to watch the film.