BECK ( ベック ) is a manga, which was later made into an anime under the name BECK: Mongolian Chop Squad. It was created by mangaka Harold Sakuishi and was originally published by Kodansha in Monthly Shonen Magazine. It tells the story of a group of Japanese teenagers who form a rock band. The manga is currently licensed in the USA by TOKYOPOP. The series has also spawned three guidebooks. BECK won the 2002 Kodansha Manga Award for shōnen.

Yukio, known by his friends as "Koyuki", is a regular 14-year-old Japanese boy who enters junior high school with two childhood acquaintances. One is now a useless pervert, and ironically the other is a highly sought after female student. Koyuki's boring life is changed when he saves an odd-looking dog, named Beck, from some kids. Beck's owner turns out to be an emerging rock musician, Ryuusuke Minami. The two become friends and their crazy, fun, and sometimes dangerous music adventure begins.

From Wikipedia

As for me, I just ended watching it this past monday, six epiodes in a row cause it became more heated, this anime rocks; watching it made me want to play Guitar Hero (cant wait for GH III for Wii). For those who like music, and is has a fan spirit for it will find Beck as a very amazing anime; my brother and I, averange rate: 9.6