i saw this movie on a fluke . i be stand on 42nd street wait for a bus to go home and a sister start pass out free ticket for a preview of this movie . i give it a chance not expect much . the promotional movie poster i have see on the subway station wall do not give this film justice at all . the movie be about a young rocker who go on a journey to learn the craft and art of heavy metal . i will leave it there . the movie be a heavy comedy and lot of fun . if your be old enough to remember when heavy metal dominate the music scene in the eighty you be go to love this film . jack black be an amazingly talented comedian and actor and assume he really write and perform the song in this film he be also a talented musician . tenacious d be definitely worth a look .