I will be composing a backing track on the subject of Duel, the 1971 feature film directed by Spielberg in which a hapless driver is terrorised by a truck driver for no apparent reason. The film is very tense and suspenseful. There is almost a supernatural element to it. It will be hard to capture the feel in 30 seconds, but I have some ideas.
I may also do a piece on the general art of story-telling if I have time. Spielberg has said that he sees himself as a story-teller primarily and that his medium is film rather than the written word.