Sometimes the flow of a film requires a very short musical cue. These are surprisingly tricky to write. An entire scene may be emotionally defined by one musical phrase, which creates pressure to come up the exact right one from countless possibilities.
Usually when writing micro-cues I reprise a fragment of existing musical material. However, for the moody driving scene from the film Craving Greatness I came up with a standalone theme just for that moment. In retrospect, I wish I could have made it longer!