This 35mm presentation is part of the Prince Charles Cinema's Cinematic Jukebox season. You can find all the details here.
Chicago Reader review:
Gene Hackman excels in Francis Ford Coppola's tasteful, incisive 1974 study of the awakening of conscience in an “electronic surveillance technician.” Coppola manages to turn an expert thriller into a portrayal of the conflict between ritual and responsibility without ever letting the levels of tension subside or the complicated plot get muddled. Fine support from Allen Garfield as an alternately amiable and desperately envious colleague, plus a superb sound track (vital to the action) by Walter Murch—all this and a fine, melancholy piano score by David Shire.
Here (and above) is the trailer.