I learned from this blog post at USA Today that Jack Black recently made an appearance with this wife, Tanya Haden, at the Grand Ole Opry.
Call me crazy, but I thought that establishment was reserved for country musicians...
Not that there's anything wrong with Jack Black, but I do tend to like his movies more than Tenacious D.
But there is that unforgettable scene in "High Fidelity" when he sings "Let's Get It On" with his band Barry Jive and the Uptown Five. Check out the clip here.
I love that movie.