Class of 1984 (1982)

A music teacher (Perry King) at a tough Los Angeles high school reaches out to his students with the gift of music -- only to find a gang of sadistic punk rockers is actively dissuading new members from joining the orchestra. Not only are the punkers sadistic; they are also led by the nefarious Timothy Van Patten. The plot development: Van Patten is a musical prodigy, as he proves by banging out some angry classical tunes on the school Baldwin in front of the teacher's startled class. King tries to befriend the lad, but he rejects the offer with scorn. When King attempts to settle for a truce with the gang leader in order to end his students' harassment, he finds himself targeted for a slowly-escalating campaign of terror, culminating in a deadly game of hide-and-seek in the high school after hours. One by one, King faces the murderous gang.