Didn't even find a message naming them... To bad, because they're great...
:-D Jack Black rules!
Tenacious D is a satirical rock band formed in Los Angeles, California. The band consists of musicians and actors Jack Black (vocals, guitar) and Kyle Gass (guitar, vocals).
Tenacious D formed in 1994 when the members performed as an acoustic duo. The band first gained popularity in 1999 when they starred in their eponymous television series and began to support large rock acts.[1] In 2001, they released Tenacious D, their debut album featuring a full band. The first single, "Tribute", was the band's most successful achieving their only Top 10 in any chart, until they released "The Metal" , which was first shown at Saturday Night Live. In 2006, they starred in, and recorded the soundtrack for, Tenacious D in The Pick of Destiny. In support of the film, the band went on a world tour, appearing for the first time with a full band.

As this little explanation states: Tribute is a great song.. It's quite funny, and just for you here are two links: A studio version, and a live version. After hearing once, you'll want to listen again, just for lyrics... Hence 2 links..
YouTube - Tenacious D - Tribute
YouTube - TENACIOUS D- 'TRIBUTE' LIVE!
I know Jack Black can be weird at first sight, but just to tribute him: here's a small movie he made... Lord of the rings by Jack Black.
YouTube - Lord of the Rings Parody - Jack Black
And for those who just can't get enough: The metal: a great song...

and yes! all their songs are like this... He talks a lot and he sings great, it works..
YouTube - Tenacious D - The Metal (VGAs)
If you're thinking: he doesn't make real songs... Listen to this, it's catchy..
YouTube - Tenacious D - POD
YouTube - TENACIOUS D - Kickapoo
And now for the real satire:
YouTube - **** her gently
This song really is explicit! Don't get offended... And don't look if you're -18 (or 21, depends where you're from)