No no, Kyle was musician first, then he taught Jack how to play...thats what I have always read, but I may be wrong.

Actually, the first I saw of Jack Black was as a bully in Never Ending Story...so that was pretty long ago...the first I heard of Tenacious D was when they palyed in Bio-Dome (1996)...its amazing, watch the film and see if you notice, well you will now, but If I didnt tell you, you would never have noticed them at all.