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Review: David Shire has one hell of a back catalogue. Active within music since the 1960s, and specifically theatre and film soundtracks in the 1970s, while many of the biggest names behind movie scores have a tendency to explore the same avenues, and therefore wind up creating tunes for relatively similar flicks, in this case that's not really true. The Taking of Pelham One Two Three (the original, of course), All The President's Men, and parts of Saturday Night Fever give some idea as to the breadth of his mastery.
The Conversation slips right in there in terms of period and genre, but is, of course, a very different classic to a movie about a New York subway train getting hijacked or social tensions in Brooklyn at the height of the disco era. While largely focused on piano solos, we also get late night dance floor jazz, tense drone, and moody avant-garde, just in case the on-screen action wasn't brooding enough already.