This iconic theme from Jurassic Park shows two key Williams techniques:

• The use of harmonies over a pedal, particularly chromatic or unusual ones. Here we have a Bb tonic pedal during the first bar
• The use of the raised fourth of the scale (from the Lydian mode) to create bright harmonies. Here the fourth note of the scale (Eb) is sharpened (to E natural) making the chord II major over the Bb rather than minor