Ever since the posthumous 1987 publication of Psychotic Reactions and Carburetor Dung, fans of rock critic Lester Bangs have been clamoring for a second compilation of the great man's work. Here 'tis -- and only three years after Cameron Crowe's Almost Famous sparked new interest in Bangs. Whether writing about Canned Heat, Bob Dylan, or Jim Morrison, Bangs was unflaggingly passionate, funny, acerbic, and astute (and often far more entertaining than the music he was covering). Added bonus: pre -- rock crit prose collected in a section called ''Drug Punk,'' the intended title of his abortive first book (editor John Morthland calls the manuscript ''maddeningly erratic''). Since Bangs was an ardent champion of the mad and the erratic, we only hope someone will publish it someday.