Now one of Hollywood's busiest and most bankable actors, Jack Black has always managed to find time in his hectic schedule for Tenacious D, the acoustic duo he formed with Kyle Gass in 1994. As Black's star has risen, so too has Tenacious D's level of popularity and the ultimate validation of their star power has arrived on the big screen. It's a film that had the potential to be very funny, but ends up as something that will only please Black and Gass' most devoted of fans.

Beginning with the story of how Tenacious D got together '...The Pick of Destiny' finds the newly formed duo on a quest to achieve rock immortality by finding a guitar pick which has been used by all the greats - and The Devil. If they can keep their heads and get the pick fame and all the best tunes are there for the taking; if not, hell or an eternity of open mic nights await.

Both Black and Gass are immensely likeable actors, but like Trey Parker and Matt Stone's 'Team America: World Police', '...The Pick of Destiny' suffers because they didn't loosen their grip on the project and get other writers involved. Written by Black, Gass and director Liam Lynch, the film runs out of good jokes and even at 90 minutes feels stretched to breaking point. It reportedly cost $20m to make; it's hard to see where it is on the screen.

Perhaps the best home away from the album racks for Tenacious D would be on TV, where Black and Gass could revive their short-lived 1997 series, collaborate with others on scripts and turn out something really memorable. What's on screen here comes a very poor second to Black's other guitars and gags movie 'School of Rock' and if you've seen that you'd be better off giving your money to a busker on the street.

Harry Guerin