This rockumentary of the famed West Texas band, combining the rhythmic musical   styles of Mexico and Texas into something they call "Texican," follows the       three Mexican-American brothers back to their roots in San Angelo, Texas.        Bypassing an exploitative approach, director Hector Galan lets the soundtrack  music grow from childhood environments and experiences to get to the real      roots of their widely-acclaimed music.                                         Hector Galan---USA---2006---89 mins.