This is a must see if you love Rock Music. Not only because the Folkrock Jack and Kyle produce is awesome, but because this is a dedication to rock music itself.
As he already did width School of Rock, Black works hard on getting the Best Music Genre out of its niche and bring it to a broader cinema audience.
It plays with all cliches and features some hillarious ideas, like the "Rock History Museum".
If you have seen the Tenacious D TV show before, you already know some (ok, most) of the songs and gags, but that doesn't matter at all.
Watch it! Go to the cinema, rent it on your way back and pre-order the DVD.
9/10