The document provides examples of film trailers that effectively use music in their soundtracks. Example 1 for The Lucky One uses shifts between instrumental and lyrical versions of songs to change the emotional tone. Example 2 for Slumdog Millionaire uses different songs to shift between suspense, comedy and emotion. Example 3 for Whiplash uniquely focuses on diegetic music from the film itself to build tension. Example 4 for Boyhood uses a single nostalgic song, alternating instrumental and lyrical versions to match the visuals.